To show that the Gaussian distribution of r for a one-dimensional random walk given in equation 8.16 has the required mean and variance, we need to first write out the equation for the Gaussian distribution.
The Gaussian distribution is given by:
f(r) = (1/√(2πσ²)) * e^(-((r-μ)²/(2σ²)))
where μ is the mean and σ² is the variance.
Now, if we substitute the values of μ and σ² from equation 8.16 into this equation, we get:
f(r) = (1/√(2πN)) * e^(-r²/(2N))
where N is the number of steps taken in the random walk.
To check if this indeed has the required mean and variance, we need to calculate the mean and variance of this distribution.
Mean:
The mean is given by:
μ = ∫(-∞ to +∞) r * f(r) dr
If we substitute the value of f(r) from above into this equation, we get:
μ = ∫(-∞ to +∞) r * (1/√(2πN)) * e^(-r²/(2N)) dr
This integral can be solved using the substitution u = r/√(2N), which gives us:
μ = ∫(-∞ to +∞) √(2N) * u * (1/√(2πN)) * e^(-u²/2) * √(2N) du
μ = 0
This shows that the mean of the Gaussian distribution is indeed 0, as required.
Variance:
The variance is given by:
σ² = ∫(-∞ to +∞) (r-μ)² * f(r) dr
If we substitute the value of f(r) from above and μ=0 into this equation, we get:
σ² = ∫(-∞ to +∞) r² * (1/√(2πN)) * e^(-r²/(2N)) dr
This integral can be solved using the substitution u = r/√(2N), which gives us:
σ² = ∫(-∞ to +∞) 2N * u² * (1/√(2πN)) * e^(-u²/2) * √(2N) du
σ² = N
This shows that the variance of the Gaussian distribution is indeed N, as required.
Therefore, we have shown that the Gaussian distribution of r for a one-dimensional random walk given in equation 8.16 indeed has the required mean and variance.
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Assume that IQ scores are normally distributed, with a standard deviation of 18 points and a mean of 100 points. If 115 people are chosen at random, what is the probability that the sample mean of IQ scores will not differ from the population mean by more than 2 points? (Round your answer to four decimal places.)
Five friends are splitting a package of 30 lemon drops if they divide the candy evenly how many lemon drops will each friend get
Answer: Each Friend will get 6 lemon drops.
Step-by-step explanation:
To find the answer we simply just have to divide 30/5 or 30 divided by 5. The answer to 30 divided by 5 is 6, therefor each friend will get 6 lemon drops.
The medal distribution from the 2021 summer Olympic Games is shown in the table What is the probability that the winner wins a gold medal and is from the United States?
The probability that a winner wins a gold medal and from the US is 0.06349
The probability a winner wins a gold medal and from the USFrom the question, we have the following parameters that can be used in our computation:
The table of values
Gold medal from the US are 48
And the total number of winners of Gold is 48 + 90 + 107 + 114 + 397
So, we have
Total = 756
So, we have
P = 48/756
Evaluate
P = 0.06349
Hence, the probability is 0.06349
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This is the first time i have been introduced to this without any help with my teacher
well, is a kite so it has two congruent triangles above and two congruent triangles below, for the perimeter is simply the hypotenuse of all four right-triangles.
[tex]\begin{array}{llll} \textit{using the pythagorean theorem} \\\\ c^2=a^2+o^2\implies c=\sqrt{a^2 + o^2} \end{array} \qquad \begin{cases} c=\stackrel{hypotenuse}{above}\\ a=\stackrel{adjacent}{4}\\ o=\stackrel{opposite}{3} \end{cases} \\\\\\ above=\sqrt{ 4^2 + 3^2}\implies above=\sqrt{ 16 + 9 } \implies above=\sqrt{ 25 }\implies above=5 \\\\[-0.35em] ~\dotfill[/tex]
[tex]\begin{array}{llll} \textit{using the pythagorean theorem} \\\\ c^2=a^2+o^2\implies c=\sqrt{a^2 + o^2} \end{array} \qquad \begin{cases} c=\stackrel{hypotenuse}{below}\\ a=\stackrel{adjacent}{3}\\ o=\stackrel{opposite}{7} \end{cases} \\\\\\ below=\sqrt{ 3^2 + 7^2}\implies below=\sqrt{ 9 + 49 } \implies below=\sqrt{ 58 } \\\\[-0.35em] ~\dotfill[/tex]
[tex]5~~ + ~~5~~ + ~~\sqrt{58}~~ + ~~\sqrt{58} ~~ \approx ~~ \text{\LARGE 25.2}[/tex]
The RAND() function in Excel returns a pseudo-random number between 0 and 1. If you enter this function into 1000 cells (i.e. enter the formula in one cell and copy it to 999 other cells), approximately how many of these cells will contain values less than or equal to 0.1?
O A number relatively close to 1
O A number relatively close to 10
O A number relatively close to 100
O A number relatively close to 500
O A number relatively close to 1000
Approximately 100 cells will contain values less than or equal to 0.1.
The RAND() function in Excel returns a pseudo-random number between 0 and 1. If you enter this function into 1000 cells, approximately 10% of these cells (0.1 probability) will contain values less than or equal to 0.1. Therefore, a number relatively close to 100 cells will have values less than or equal to 0.1.
The RAND() function is a built-in function in Excel that generates a random decimal number between 0 and 1. Each time the function is used, a new random number is generated.
The syntax for using the RAND() function is: =RAND() The function takes no arguments and simply returns a random decimal number.
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39. Find the equation of the line that passes through (2, 5) and (8, 10)
Answer:
5/6
Step-by-step explanation:
y2-y1/x2-x1
10-5/8-2 = 5/6
In a nonlinear problem, the rate of change of the objective function with respect to the right-hand side of a constraint is given by the:
slope of the contour line.
local optimum.
Reducing gradient.
Lagrangian multiplier.
In a nonlinear optimization problem:
the objective function is a nonlinear function of the constraints.
all the constraints are nonlinear only when the objective is to maximize the function of the decision variables.
at least one term in the objective function or a constraint is nonlinear.
both the objective function and the constraints must have all nonlinear terms.
In a nonlinear problem, the rate of change of the objective function with respect to the right-hand side of a constraint is given by the Lagrangian multiplier.
In a nonlinear optimization problem, at least one term in the objective function or a constraint is nonlinear. The objective function may be a nonlinear function of the constraints and the constraints may also be nonlinear, but not necessarily all of them.
The Lagrangian multiplier is a way to incorporate constraints into the optimization problem and find a solution that satisfies them. The slope of the contour line and reducing gradient are not directly related to the Lagrangian multiplier or the nonlinear optimization problem.
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A hiker keeps track of all the animal species she observes while on a hike. Of all the species she observes, 60% are insects. The hiker saw at least 12 different species of insects. Write an inequality that represents the total number of species, s, the hiker observed.
The inequality that represents the total number of species, s, the hiker observed, is s ≥ 20
How to find the inequality ?To represent the entirety of species seen by the hiker, we formulate an inequality as 60% of them were insects and she sighted not less than a dozen insect species.
Denoting "i" as the quantity of insect species, we translate conditions that the hiker witnessed at minimum twelve distinct types of bugs dissimilar from other species. Consequently, this yields:
i ≥ 12
We know that i = 0.6s. So we have:
0.6 s ≥ 12
s ≥ 12 / 0.6
s ≥ 20
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Your professor gives a true/false quiz with 10 questions. The minimum score required to pass is 60% correct. You were too busy to study for the quiz, so you just randomly guess on each question. Let X be the number of questions you guess correctly. Theoretically, how many questions should you expect to get correct?
Theoretically, you should expect to get 5 questions correct by randomly guessing on a 10-question true/false quiz.
Since this is a true/false quiz with 10 questions, if you were to guess randomly on each question, you would have a 50/50 chance of getting each question correct. Therefore, the probability of guessing correctly on any one question is 0.5.
Let X be the number of questions you guess correctly. Since each question is independent of the others, we can use the binomial distribution to calculate the expected value of X.
The formula for the expected value of a binomial distribution is:
E(X) = n * p
where n is the number of trials (in this case, the number of questions) and p is the probability of success on each trial (in this case, the probability of guessing a question correctly, which we calculated to be 0.5).
So, plugging in the numbers:
E(X) = 10 * 0.5 = 5
Therefore, theoretically, you should expect to get 5 questions correct if you randomly guess on each question. However, since the minimum score to pass is 60%, you would need to get at least 6 questions correct to pass.
To answer your question, let's consider the terms "minimum score", "questions", and "true/false". You have a true/false quiz with 10 questions, and you need a minimum score of 60% correct to pass. Since you're randomly guessing, the probability of getting each question correct is 50% or 0.5.
Now, let's calculate the expected number of correct questions, X. To do this, we multiply the probability of getting a question correct (0.5) by the total number of questions (10):
X = 0.5 * 10
X = 5
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State whether the situation below uses permutations or combinations. Then calculate the answer.
The Debate Club contains 13 members. They need to elect 3 members to the executive board: a president, vice president, and secretary. How many different executive boards are possible?
The requried, there are 1,716 different executive boards possible.
This situation uses permutations because the order of the elected positions (president, vice president, and secretary) matters.
To calculate the number of possible executive boards, we can use the permutation formula:
n P r = n! / (n - r)!
where n is the total number of items (members in this case), and r is the number of items being selected (3 in this case).
Substituting the values, we get:
13 P 3 = 13! / (13 - 3)!
= 13! / 10!
= 13 x 12 x 11
= 1,716
Therefore, there are 1,716 different executive boards possible.
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Explain how to do function operation and function composition. Use the following functions to complete f(x) + g(x), g(x) - f(x), f(x) - g(x), g(f(x)) and f(g(x)). Explain why you don’t need to do both f(x) + g(x) and g(x) + f(x). f(x) = 2x - 1 and g(x) = x^2 - 9x - 4
Answer:
Function operation and function composition are two fundamental concepts in mathematics that are commonly used in algebra, calculus, and other branches of mathematics.
Function operation involves performing arithmetic operations on two or more functions to create a new function. To find the result of f(x) + g(x), we simply add the two functions together:
f(x) + g(x) = (2x - 1) + (x^2 - 9x - 4) = x^2 - 7x - 5
Similarly, we can find g(x) - f(x) and f(x) - g(x) by subtracting one function from the other:
g(x) - f(x) = (x^2 - 9x - 4) - (2x - 1) = x^2 - 11x - 3
f(x) - g(x) = (2x - 1) - (x^2 - 9x - 4) = -x^2 + 11x - 3
Function composition, on the other hand, involves plugging one function into another function to create a new function. To find g(f(x)), we first evaluate f(x) and then plug the result into g(x):
g(f(x)) = g(2x - 1) = (2x - 1)^2 - 9(2x - 1) - 4 = 4x^2 - 25x - 14
Similarly, we can find f(g(x)) by plugging g(x) into f(x):
f(g(x)) = f(x^2 - 9x - 4) = 2(x^2 - 9x - 4) - 1 = 2x^2 - 18x - 9
Now, to answer your question about why we don't need to do both f(x) + g(x) and g(x) + f(x), it's because addition is commutative, which means that the order of the terms doesn't matter. Therefore, f(x) + g(x) is the same as g(x) + f(x). The same is true for subtraction. However, this is not the case for function composition, as plugging one function into another is not commutative.
The distance between two triangulation points is found to be x miles. That same distance is y kilometres. If the difference between the numbers x and y is 27, find the value of x.
The value of x is approximately 44.31km
Here is how to calculate a missing valueFirstly, we should know that 1 mile is not the same as kilometres, therefore:
1 mile = 1.60934 km.
Since the difference of x and y gives us 27, we represent it as:
x - y = 27 (in km)
But x is given in miles, so we have
1.60934x - y = 27km
Also the question says the distance x is same as y, then we replace y with x in the above equation:
1.60934x - x = 27
0.60934x = 27
x = 27/0.60934
Therefore x = 44.31km
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between 1976 and 2016, the usa olympic team has participated in 10 olympic games (the team usa has missed the moscow 1980 games due to the cold war). the total number of gold medals won in each of the 10 games ranged between 33 and 83. the number of gold medals won in each of the games is listed below: 33 34 83 36 37 44 37 36 46 47 calculate the value, in number of gold medals, at the 69.5th percentile (show work). (2 points)'
To calculate the value at the 69.5th percentile, we first need to find the rank of this percentile.
69.5th percentile = (69.5/100) x 10 = 6.95th rank
Plugging in the values:
value = (6.95 - 6) / (7 - 6) x (44 - 37) + 37
value = 40.7
Therefore, the value at the 69.5th percentile is 40.7 gold medals.
To calculate the value at the 69.5th percentile, follow these steps:
1. Arrange the data in ascending order:
33, 34, 36, 36, 37, 37, 44, 46, 47, 83
2. Determine the position of the 69.5th percentile in the dataset:
Position = (Percentile / 100) * Total number of data points
Position = (69.5 / 100) * 10 = 6.95
Since the position is not a whole number, we'll need to interpolate between the values at positions 6 and 7.
3. Find the values at positions 6 and 7:
Value at position 6 = 37
Value at position 7 = 44
To interpolate between these two values, we use the percentile formula:
value = (rank - rank_ lower) / (rank_ upper - rank_ lower) x (value_ upper - value_ lower) + value_ lower
where:
- rank = 6.95
- rank_ lower = 6
- rank_ upper = 7
- value_ lower = 37
- value_ upper = 44
4. Interpolate between the values at positions 6 and 7:
Value at 69.5th percentile = Value at position 6 + ((Position - Position 6) * (Value at position 7 - Value at position 6))
Value at 69.5th percentile = 37 + ((6.95 - 6) * (44 - 37))
Value at 69.5th percentile = 37 + (0.95 * 7)
Value at 69.5th percentile = 37 + 6.65
Value at 69.5th percentile = 43.65
The value at the 69.5th percentile is approximately 43.65 gold medals.
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Please help me with this homework only the answer
try (-18,-5)
my step by step explanation is you would distrubute the -5 and add it to the -13 and you would do the same thing for the orher side
hopefully this is correct
and may i have brainliest
PLEASE HELP ME ASAP!!!!
SHOW ALL WORK
Answer:
214 inches
Step-by-step explanation:
Arc length = 2πr(∅/360) = 2π(48)(255/360) = 68π = 213.63 ≈ 214 inches
The circle shown below has a diameter of 12 centimeters. What is the
approximate area of the shaded sector?
310
OA. 226 cm²
B. 102 cm²
C. 390 cm²
D. 97 cm²
The approximate area of the shaded sector is D. 97 cm²
What is the approximate area of the shaded sector?From the question, we have the following parameters that can be used in our computation:
Central angle = 310 degrees
Diameter = 12 cm
The area of the shaded sector is calculated as
Area = Central angle/360 * π(d/2)²
Substitute the known values in the above equation, so, we have the following representation
Area = 310/360 * 3.14 * (12/2)²
Evaluate
Area = 97.34
Approximate
Area = 97
Hence, the area is 97
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Which of the following is an appropriate null hypothesis for the company to test? A. The observed counts are all equal to 50 B. The observed counts are equal to the expected counts C. The proportion of people in the population who trust each brand is the same for all five brands D. For at least one of the brands, the proportion of people in the population who trust this brand most is different from the other four proportions 8.
The appropriate null hypothesis for the company to test depends on the specific study or experiment being conducted.
However, in the given options, option C is the appropriate null hypothesis for the company to test. This hypothesis states that the proportion of people in the population who trust each brand is the same for all five brands. This hypothesis can be tested using statistical methods to determine if there is a significant difference in trust levels between the five brands. Options A and B are not appropriate null hypotheses as they do not make a specific statement about the relationship between the variables being studied. Option D is an alternative hypothesis, which suggests that there is a difference in trust levels between at least one of the brands and the other four.
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suppose sat writing scores are normally distributed with a mean of 489 and a standard deviation of 112 . a university plans to award scholarships to students whose scores are in the top 6% . what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.
Minimum score required for the scholarship = 605
To find the minimum score required for the scholarship, we need to find the score that corresponds to the top 6% of scores.
First, we need to find the z-score that corresponds to the top 6%. We can use the standard normal distribution table or calculator to find this.
Using the calculator, we can input:
normalcdf(0.94,9999)
This gives us the area under the curve to the right of z=0.94, which is the z-score that corresponds to the top 6%.
We get: 0.1664
This means that the top 6% of scores correspond to z-scores greater than 0.94.
Now we can use the z-score formula:
z = (x - μ) / σ
where x is the score we want to find, μ is the mean (489), and σ is the standard deviation (112).
Rearranging this formula, we get:
x = z * σ + μ
Substituting in the values we have:
x = 0.94 * 112 + 489
x = 605.08
Rounding this to the nearest whole number, we get:
Minimum score required for the scholarship = 605
To find the minimum score required for the scholarship, we will use the given information about the SAT writing scores being normally distributed with a mean (µ) of 489 and a standard deviation (σ) of 112. We need to find the score that corresponds to the top 6%.
Step 1: Convert the percentage to a decimal. Top 6% = 0.06.
Step 2: Find the Z-score that corresponds to the top 6%. This means we want to find the Z-score that has 1 - 0.06 = 0.94 area to the left. Using a Z-table, you can find that the Z-score is approximately 1.555.
Step 3: Use the Z-score formula to find the minimum score (X):
Z = (X - µ) / σ
1.555 = (X - 489) / 112
Step 4: Solve for X:
1.555 * 112 = X - 489
174.16 = X - 489
X = 663.16
Round to the nearest whole number: X = 663.
So, the minimum score required for the scholarship is 663.
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A study was done to determine whether the gender of the credit card holder was an important fac- tor in generating profit for a certain credit card com- pany. The variables considered were income, the num- ber of family members, and the gender of the card holder. The data are as follows: Family Profit Income Gender Members 157 45,000 M -181 55,000 M 2 -253 45,800 M 4 158 38,000 M 3 75 75,000 M 4 202 99,750 M 4 -451 28,000 M 1 146 39,000 M 2 89 54,350 M 1 -357 32,500 M 1 522 36,750 F 1 78 42,500 F 3 5 34,250 F 2 -177 36,750 F 3 123 24,500 F 2 251 27,500 F 1 -56 18,000 F 1 453 24,500 F 1 288 88,750 F 1 -104 19,750 F 2 (a) Fit a linear regression model using the variables available. Based on the fitted model, would the company prefer male or female customers? (b) Would you say that income was an important fac- tor in explaining the variability in profit? NNN
(a) If the coefficient for Gender is positive and statistically significant, it would indicate that male customers (assuming M = 1 and F = 0) generate more profit. If the coefficient is negative and significant, it would indicate that female customers generate more profit.
(b) To determine if income is an important factor in explaining the variability in profit, examine the coefficient (b1) and its significance level (usually a p-value). If the coefficient is statistically significant (p-value < 0.05), then income is an important factor in explaining the variability in profit.
(a) To fit a linear regression model using the given variables, we can use profit as the dependent variable and income, the number of family members, and gender as the independent variables. The resulting model would be:
Profit = b0 + b1*Income + b2*Family Members + b3*Gender
Where b0, b1, b2, and b3 are the coefficients to be estimated.
Using software or a statistical tool, input the data and run the linear regression. Once you have the coefficients, you can interpret the results.
Using this model, we can determine the effect of each variable on the profit generated. The coefficients for each variable can be obtained through regression analysis. Based on the fitted model, we can compare the coefficients for the male and female gender and see which one is more significant in generating profit for the company. If the coefficient for the male gender is higher, then the company would prefer male customers.
(b) To determine if income was an important factor in explaining the variability in profit, we can look at the coefficient for income in the fitted model. If the coefficient is significant and positive, then we can say that income has a positive effect on profit and is an important factor in explaining the variability in profit. However, if the coefficient is not significant or negative, then we cannot say that income is an important factor in explaining the variability in profit.
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if i multiply one side of an equality by ten, to maintain the equality, what do i have to do to the other side (3 words)?
You need to multiply one side of an equality by ten and divide the other side by ten.
How to maintain equality?Divide by ten.
To maintain equality, you need to multiply one side of an equality by ten and divide the other side by ten.
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If i multiply one side of an equality by ten, to maintain the equality, i have to divide the other side by ten. o
When you multiply one side of an equality by ten, you are effectively scaling that side by a factor of ten. In order to maintain the equality, you need to apply the same scaling factor to the other side by dividing it by ten. This ensures that the relative relationship between the two sides remains unchanged, and the equality is preserved.
Therefore, to maintain equality, you need to multiply one side of an equality by ten and divide the other side by ten.
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The population of a town in 2000 was 120,000 people. The town grew at a rate of 3% annually. How many people live in the town in 2018?
suppose company c produces packages of hazelnuts that are normally distributed with a mean of 93.5 individual hazelnuts and a standard deviation of 2.4 hazelnuts. company d produces packages of hazelnuts that are normally distributed with a mean of 95.9 individual hazelnuts and a standard deviation of 2.9 hazelnuts. select from the drop-down menus to correctly complete the statement.
The mean number of hazelnuts in company c's packages is 93.5 and the mean number of hazelnuts in company d's packages is 95.9. Additionally, the standard deviation of hazelnuts in company c's packages is 2.4 and the standard deviation of hazelnuts in company d's packages is 2.9.
The mean number of hazelnuts in company c's packages is _____ and the mean number of hazelnuts in company d's packages is _____. Additionally, the standard deviation of hazelnuts in company c's packages is _____ and the standard deviation of hazelnuts in company d's packages is _____.
The mean number of hazelnuts in company c's packages is 93.5 and the mean number of hazelnuts in company d's packages is 95.9. Additionally, the standard deviation of hazelnuts in company c's packages is 2.4 and the standard deviation of hazelnuts in company d's packages is 2.9. These values indicate that on average, company d's packages contain more hazelnuts than company c's packages. However, there is also more variability in the number of hazelnuts in company d's packages, as indicated by the larger standard deviation. This means that there is a greater chance of receiving a package with an unusually high or low number of hazelnuts from company d compared to company c. It is important for consumers to be aware of these differences when making purchasing decisions and to consider their individual preferences for consistency versus quantity.
Company C and Company D both produce packages of hazelnuts, with their respective distributions being normally distributed. For Company C, the mean number of individual hazelnuts in a package is 93.5, and the standard deviation is 2.4. This implies that, on average, each package from Company C contains 93.5 hazelnuts, with the majority of packages having a count between 91.1 and 95.9 hazelnuts (i.e., within one standard deviation).
On the other hand, Company D's packages have a mean of 95.9 individual hazelnuts, with a standard deviation of 2.9. Therefore, the average number of hazelnuts in a package from Company D is higher than that of Company C. Most packages from Company D will have a count between 93.0 and 98.8 hazelnuts, which is within one standard deviation from the mean.
In comparing the two companies, it is evident that Company D produces packages with a greater average number of hazelnuts. Additionally, the standard deviation for Company D is larger than that of Company C, indicating that there is more variability in the number of hazelnuts per package for Company D. When choosing between the two companies, customers who prioritize a higher average hazelnut count may prefer Company D, while those who value consistency in package contents might lean towards Company C.
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Help
Due April 18 2023
Thanks if you help! :)
The area of the concrete patio is 280.86 ft²
What is the area of the concrete patio?
The area of a circle of radius R is:
A = pi*R²
Where pi = 3.14
And for half a circle the area is half of that.
Here we can see that the diameter is (26 + 3/4) ft
so the radius is:
R = (26 + 3/4)/2 ft
R = (13 + 3/8) ft
Replacing that in the area formula we will get:
A = 0.5*3.14*(13 + 3/8)² = 280.86 ft²
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The causal theory of perception is the view that our experiences (our sensations and ideas) are the effects of physical objects acting on our sense organs (which are thereby the causes).a. Trueb. False
True. The causal theory of perception is the view that our experiences, such as our sensations and ideas, are caused by physical objects acting on our sense organs.
According to this causal theory of perception, when an object in the external world acts on our sense organs, it causes certain neural processes to occur, which in turn give rise to our conscious experiences. The causal theory of perception holds that there is a causal relationship between physical objects in the external world and our conscious experiences. When an object interacts with our sense organs, it causes certain neural processes to occur in our brain, which ultimately give rise to our conscious experiences of the object. So, the physical object is the cause, and our conscious experience is the effect.
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Please help me with this homework only the answer
Answer:
[tex]\frac{11}{9}[/tex]
Step-by-step explanation:
[tex]\frac{change in y}{change in x}[/tex]
[tex]\frac{-14-(-3)}{-9-0}[/tex] = [tex]\frac{-14+3}{-9-0}[/tex] = [tex]\frac{-11}{-9}[/tex] = [tex]\frac{11}{9}[/tex]
Helping in the name of Jesus,
note that in actual scientific practice, we only select one single sample and therefore we can only see the one corresponding interval, out of the potential thousands that are displayed using the applet. based on what you've learned from the simulation (the applet), give the best interpretation of a single 95% confidence interval as follows: we are [ select ] confident that our interval is one that [ select ] contain [ select ] .
In scientific practice, we often use statistical inference to make conclusions about a population based on a sample. The use of confidence intervals is one method of making these inferences. A single 95% confidence interval can be interpreted as follows: we are 95% confident that our interval is one that contains the true population parameter.
This means that if we were to repeat the study many times, we would expect the true population parameter to be within our interval 95% of the time.
It is important to note that this interpretation assumes that the sample was selected randomly and that the assumptions for the statistical test used to construct the interval were met. Additionally, it is important to recognize that the interval is not a guarantee of the true population parameter being within it, but rather a range of values that is likely to contain the true parameter.
Overall, a single 95% confidence interval is a useful tool for making inferences about a population based on a sample, and it provides a range of values that we can be reasonably confident contains the true parameter.
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a. The area of the new parking lot is represented by (100-x)(100+2). Find this product.
ft²
b. Does the area of the parking lot increase, decrease, or stay the same?
The area of the parking lot
:: increases
:: decreases
The original area is 10,000 ft², so the new area is the original area
:: stays the same :: increased by ² :: decreased by ²
c. Use the polynomial in part (a) to find the area of the new parking lot when * = 21.
:: left alone
The solution to the questions on algebra word problem are:
a) 10000 - x²
b) The area of the parking lot decreases
c) when x = 21, the area is 9559 ft²
How to solve algebraic word problems?a) Since the area of the new parking lot is expressed as:
(100 - x)(100 + x)
Expanding this gives:
10000 - x²
b) The original area is 10,000 ft²
The new area is 10000 - x²
Thus:
10,000 - (10000 - x²) = x²
Thus, the area of the parking lot decreases
c) when x = 21, we have:
10000 - 21² = 9559 ft²
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The perimeter of parallelogram ABCD is 78 cm. AD is 9 cm more than twice AB. Find the lengths of all four sides of ABCD.
Answer:
AB = 10
CD = 10
AD = 29
BC = 29
Step-by-step explanation:
perimeter = AD + BC + AB + CD
AD + BC + AB + CD = 78
Let AB = x
Opposite sides of a parallelogram are congruent.
AB = CD = x
AD = BC = 2x + 9
2x + 9 + 2x + 9 + x + x = 78
6x + 18 = 78
6x = 60
x = 10
2x + 9 = 2(10) + 9 = 29
AB = 10
CD = 10
AD = 29
BC = 29
Answer:
AB = 10 CD = 10 AD = 29 BC = 29
Step-by-step explanation:
I did the test
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A coordinate grid showing Time in hours on the x-axis and Distance from Start in miles. A line plotted passing through the 2 points at (0, 0) and (3, 180).
Abigail drives at an average speed of 60 miles per hour for 3 hours. The graph shows her distance versus time. Which statements are true? Check all that apply.
The true statements about the distance and average speed of Abigail are
a) As Abigail’s time increases, her distance increases
b) At 2 hours, Abigail has traveled 120 miles
c) At 3 hours, Abigail has traveled 180 miles
Given data ,
A coordinate grid showing Time in hours on the x-axis and Distance from Start in miles.
A line plotted passing through the 2 points at P ( 0 , 0 ) and Q ( 3 , 180 )
Now , the slope of the line is m = ( 180 / 3 ) = 60 miles / hour
So , the equation of line is y = 60x
And , at 2 hours , the distance traveled by Abigail is y = 2 ( 60 ) = 120 miles
And , at 3 hours , the distance traveled by Abigail is y = 3 ( 60 ) = 180 miles
Hence , the statements are true and equation of line is y = 60x
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The complete question is attached below :
A coordinate grid showing Time in hours on the x-axis and Distance from Start in miles. A line plotted passing through the 2 points at (0, 0) and (3, 180).
Abigail drives at an average speed of 60 miles per hour for 3 hours. The graph shows her distance versus time. Which statements are true? Check all that apply.
A cylinder is sliced in such a way that the plane passes through the cylinder in a slanted direction without going through either base, what is the resulting cross section?
When a cylinder is sliced in such a way that the plane passes through the cylinder in a slanted direction without going through either base, the resulting cross section is an elliptical shape.
To visualize this, imagine a cylinder with circular bases. When a plane intersects the cylinder in a slanted direction, it cuts through the curved surface of the cylinder, creating an elliptical cross section.
The exact shape and size of the elliptical cross section will depend on the angle at which the plane intersects the cylinder and the specific orientation of the cylinder. The major axis of the resulting ellipse will be parallel to the slanted direction of the plane, while the minor axis will be perpendicular to it.
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