The whole number(s) are 3 and -2. A whole number doesn't have fractions or places after the decimal.
How to explain the numberThe natural number(s) is 3. Think of a natural number as those used for counting, like "1, 2, 3, 4..."
The integer(s) are 3 and -2. An integer includes positive or negative whole numbers, and 0.
The rational number(s) are 3, -2, and 1/4. A rational number can be written as a fraction.
And irrational number, the square root of 5, cannot be written as a fraction. It is the opposite of a rational number.
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Using diagram whole numbers, natural numbers, integers, and rational or irrational numbers, which category does -2, 3, 1/4, and square root of 5
which is a whole number, natural number, integer, or rational or irrational number: -2, 3, 1/4, and square root of 5
(a) The equation of a straight line given y = bx + a, where b is equal to +5. What can you explain on the relationship between the two variables, x and y? (2 marks) (b) If there is a very strong correlation between two variables then the correlation coefficient must be any value near to 0. Is the statement true? State your reason.
(a) In the equation of a straight line, y = bx + a, where b is equal to +5,
The relationship between the two variables, x and y, is a positive linear relationship. Since b is positive (+5), as the value of x increases, the value of y will also increase proportionally. The slope of the straight line is 5, indicating that for every unit increase in x, y will increase by 5 units.
(b) The statement is false.
A very strong correlation between two variables means the correlation coefficient is close to -1 or +1. If the correlation coefficient is near 0, it indicates that there is little to no correlation between the two variables.
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Car Loans While shopping for a car loan, you get the following offers: Solid Savings & Loan is willing to loan you $10,000 at 9% interest for 4 years. Fifth Federal Bank & Trust will loan you the $10,000 at 7% interest for 3 years. Both require monthly payments. You can afford to pay $250 per month. Which loan, if either, can you take?
The loan you can take is : Solid Savings & Loan at 9% interest for 4 years.
To determine which loan you can take, you need to calculate the monthly payments for each option.
For the loan from Solid Savings & Loan, the total interest over 4 years would be $3,600 ($10,000 x 0.09 x 4). This means that the total amount you would need to repay over 4 years would be $13,600 ($10,000 + $3,600). Divided by 48 months, your monthly payment would be $283.33 ($13,600 / 48).
For the loan from Fifth Federal Bank & Trust, the total interest over 3 years would be $2,100 ($10,000 x 0.07 x 3). This means that the total amount you would need to repay over 3 years would be $12,100 ($10,000 + $2,100). Divided by 36 months, your monthly payment would be $336.11 ($12,100 / 36).
Since you can afford to pay $250 per month, you cannot take the loan from Fifth Federal Bank & Trust as the monthly payment is higher than what you can afford. However, you can take the loan from Solid Savings & Loan as the monthly payment is $250. Therefore, the loan you can take is from Solid Savings & Loan at 9% interest for 4 years.
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Which of the given data sets is less variable? a. 1,1,2,2,3,3,4,4 b. 1,1,1, 1,8,8,8,8 C. -1, -0.75, -0.5, -0.25,0,0,0,0.25, 0.5, 0.75, 1 d. None e. 1,1.5, 2, 2.5, 3, 3.5, 4, 4.5 f. 1,1,1,4,5,8,8,8 g
Hi! To determine which data set is less variable, we can compare their ranges. The range is calculated by subtracting the minimum value from the maximum value in the data set.
a. 4 - 1 = 3
b. 8 - 1 = 7
c. 1 - (-1) = 2
e. 4.5 - 1 = 3.5
f. 8 - 1 = 7
The data set with the least variability is option C, with a range of 2.
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The volume of water in a vase is proportional to the depth
of the water. When there are 63 mL of water in the vase,
the depth is 7 cm. How much water is in the vase when
the depth is 9 cm?
When the depth of water in the vase is 9 cm, there are 81 mL of water in the vase.
Since the volume of water in the vase is proportional to the depth, we can write:
The volume of water in the vase = constant x depth of water
Let's call the constant of proportionality "k". Then we have:
The volume of water in the vase = k x depth of water
To find the value of "k", we can use the information given in the problem. When there are 63 mL of water in the vase, the depth is 7 cm. So we have:
63 mL = k × 7 cm
Solving for "k", we get:
k = 63/7 = 9 mL/cm
Now we can use this value of "k" to find how much water is in the vase when the depth is 9 cm:
The volume of water in the vase = k × depth of water
Volume of water in vase = 9 × 9
The volume of water in the vase = 81 mL
It's important to note that this proportionality assumes that the vase has a constant cross-sectional area. If the shape of the vase changes with depth, the relationship between volume and depth will not be proportional.
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An arch is in the shape of a parabola. It has a span of 360 feet and a maximum height of 36 feet.
The equation of the parabola is y² = 900x
We know that the equation of the parabola is y² = 4ax
Since the arch has a span of 360 meters and a maximum height of 36 feet.
The coordinates of the ends of the parabola would be (36, ±180)
So, equation of becomes,
180² = 4 × a × 36
⇒ a = 32400/144
⇒ a = 225
So, the equation of the parabola:
y² = 4(225)x
y² = 900x
This is the required equation.
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The complete question is:
An arch is in the shape of a parabola. It has a span of 360 meters and a maximum height of 36 feet. Find the equation of the parabola.
Find the A value from this equation. 0.242 = logio CRnx CF ICF Rn= 1.334X10 CE=?
The A value from the given equation is CE = (io^0.118)/10.
To find the A value from the equation 0.242 = log of CRnx CF ICF Rn= 1.334X10 CE=?, we need to isolate the variable A on one side of the equation. We can start by using the definition of logarithms, which states that log of CRnx CF ICF Rn= A is equivalent to CRnx CF ICF Rn= io^A.
Substituting the given values, we get:
1.334X10 CE= io^A
Taking the logarithm of both sides with base 10, we get:
logio (1.334X10 CE) = logio (io^A)
Using the logarithmic identity logio (a^b) = b*logio (a), we can simplify the left-hand side to:
logio (1.334X10 CE) = logio (1.334) + logio (10 CE)
Now we can substitute the given value of logio CRnx CF ICF Rn= 0.242:
0.242 = logio (1.334) + logio (10 CE)
Solving for logio (10 CE), we get:
logio (10 CE) = 0.242 - logio (1.334)
logio (10 CE) = 0.242 - 0.124
logio (10 CE) = 0.118
Finally, we can solve for CE by exponentiating both sides with base 10:
10 CE = io^0.118
CE = (io^0.118)/10
Therefore, the A value from the given equation is CE = (io^0.118)/10.
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2. Supposed the prevalence of Sudden infant death syndrome (SIDS) is 0.01%. At a local Maternity hospital 3 of the 100 newborn infants died of SIDS following birth. a. What is the probability of 3 dying of SIDS in this situation? b. In this situation would you find it alarming that this many died or would this be expected. Why or why not? (write 1-3 sentences explaining
The probability of 3 dying of SIDS in this situation is approximately 0.000227. The number of SIDS cases in this hospital is significantly higher than the expected rate.
a. The probability of 3 infants dying of SIDS in this situation can be calculated using the binomial probability formula:
P(X=k) = C(n,k) * p^k * (1-p)^(n-k)
Where:
P(X=k) is the probability of k successes (SIDS cases) in n trials (infants),
C(n,k) is the number of combinations of n items taken k at a time,
p is the probability of SIDS (0.0001),
n = 100 infants,
k = 3 SIDS cases.
P(3 SIDS cases in 100 infants) = C(100,3) * (0.0001)^3 * (1-0.0001)^(100-3)
After calculating, the probability is approximately 0.000227.
b. In this situation, it is alarming that many infants died of SIDS, as the probability of 3 deaths in 100 infants is very low (0.000227), much lower than the prevalence of 0.01%. This indicates that the number of SIDS cases in this hospital is significantly higher than the expected rate.
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The current cost of replacing a wood fence is $25,000. Assuming an annual inflation rate of 3%, what is the projected cost of the fence after 4 years?
With a 3% annual inflation rate, the predicted cost of the fence after four years is $28,138.75.
What is inflation rate?The inflation rate is the percentage by which a currency devalues over time. The fact that the consumer price index (CPI) rises over this period demonstrates the devaluation. In other words, it is the pace at which the currency is devalued, leading overall consumer prices to rise compared to the change in currency value.
To calculate the projected cost of the fence after 4 years with an annual inflation rate of 3%, we can use the following formula:
[tex]Projected Cost = Current Cost * (1 + Inflation Rate)^{Number of Years[/tex]
Plugging in the given values, we get:
Projected Cost = $25,000 x (1 + 0.03)⁴
Projected Cost = $25,000 x 1.1255
Projected Cost = $28,138.75
Therefore, the projected cost of the fence after 4 years with an annual inflation rate of 3% is $28,138.75.
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POEEASE HELP ME ISTG I CANT GET ANYONE TO ANSWER MY QUESTIONS ILL GIVE BRAINLIEST PLEASE I BEG YOU
A wooden block is a prism, which is made up of two cuboids with the dimensions shown. The volume of the wooden block is 427 cubic inches.
Part A
What is the length of MN?
Write your answer and your work or explanation in the space below.
Part B
200 such wooden blocks are to be painted. What is the total surface area in square inches of the wooden blocks to be painted?
PLEASE GIVE A SOMEWHAT DETAILED EXPLANATION THANK YOUU!!! ^^
The length of MN is 12 inches, total surface area in square inches of the wooden blocks to be painted is 80400 square inches and
The formula for volume of a cuboid is:
Volume = Length× Width × Height
Thus 427 = (MN × 7× 3) + (5 × 5 × 7)
427 = 21MN + 175
21MN = 252
MN = 252/21
MN = 12
2) Surface area of entire object is:
TSA = 2(12 × 3) + 2(12×7) - (5 × 7) + 2(7×3) + 3(5 × 7) + 2(5 ×5)
= 402 in²
For 200 blocks:
TSA = 200× 402 = 80400 in²
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At Jefferson Middle school, eighty-two students were asked which sports they plan to participate in for
the coming year. Twenty students plan to participate in track and cross country; six students in cross
country and basketball; and eight students in track and basketball. Twelve students plan to participate in
all three sports. A total of thirty students plan to participate in basketball, and a total of forty students
plan to participate in cross country. Ten students don't play to participate in any of the three sports.
How many students plan to participate in at least 2 sports?
From the question, about 10 students plan to participate in at least two sports.
What is the sport about?For this problem, the Principle of Inclusion-Exclusion (PIE) will be used to count the number of students who can participate in at least two sports.
Note that from the question:
Track and cross country: 20Cross country and basketball: 6Track and basketball: 8All three sport = 12Basketball only: 30 - 6 - 8 - 12 = 4Cross country only: 40 - 6 - 20 - 12 = 2None of the sports: 10Students planning to participate in basketball: 30Students planning to participate in cross country: 40Students not planning to participate in any of the three sports: 10So the Number of students participate in at least two sports:
= 20 + 6 + 8 - 2 x (12)
= 20 + 6 + 8 - 24
= 10
Therefore, 10 students plan to participate in at least two sports.
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Give the reason(s) for each step needed to show that the following argument is valid.[p ∩ (p → q) ∩ (s ∪ r) ∩ (r → ¬p)] → (s ∪ t)1. p2. p→q3. q4. r → ~p5. q → ~r6. ~r7. s ∪ r8. s9. ∴ s ∪ t
The given argument is valid.
To show that the following argument is valid, we will use the given terms and follow a step-by-step explanation.
Argument: [p ∩ (p → q) ∩ (s ∪ r) ∩ (r → ¬p)] → (s ∪ t)
Steps:
1. p (Premise)
2. p → q (Premise)
3. q (From 1 and 2 using Modus Ponens: If p is true and p → q is true, then q is true)
4. r → ~p (Premise)
5. q → ~r (From 1 and 4 using the Contrapositive: If p is true and r → ~p is true, then q → ~r is true)
6. ~r (From 3 and 5 using Modus Ponens: If q is true and q → ~r is true, then ~r is true)
7. s ∪ r (Premise)
8. s (From 6 and 7 using Disjunction Elimination: If ~r is true and s ∪ r is true, then s is true)
9. ∴ s ∪ t (From 8 using Disjunction Introduction: If s is true, then s ∪ t is true)
By following these steps, we have shown that the given argument is valid.
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Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviations is given below: n1=43,n2=40,x¯1=57.5,x¯2=72.6,s1=5.8s2=11 Find a 95.5% confidence interval for the difference μ1−μ2 of the means, assuming equal population variances. Confidence Interval = Confidence Interval =
With 95.5% confidence that the true difference between the means of the two populations falls within the interval (-19.052, -11.148)
To find the confidence interval for the difference of the means, we can use the formula:
[tex]Confidence Interval = (X1 - X2) ±\frac{ta}{2} , df \sqrt{\frac{(s1)^{2} }{n1} + \frac{(s2)^{2} }{n2} }[/tex]
where x1 and x2 are the sample means, s1 and s2 are the sample standard deviations, n1 and n2 are the sample sizes, and tα/2,df is the t-score from the t-distribution table with (n1 + n2 - 2) degrees of freedom and a confidence level of 95.5%.
Plugging in the given values, we get:
[tex]Confidence Interval = (57.5 - 72.6) ± t0.022,81 \sqrt{\frac{(5.8)^{2} }{43} + \frac{(11)^{2} }{40} }[/tex]
[tex]Confidence Interval = -15.1 ± 2.539 (1.553)[/tex]
Confidence Interval = -15.1 ± 3.952
Confidence Interval = (-19.052, -11.148)
Therefore, we can say with 95.5% confidence that the true difference between the means of the two populations falls within the interval (-19.052, -11.148).
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test the claim that the proportion of men who own cats is larger than 90% at the .005 significance level.
At the .005 significance level with a one-tailed test, the critical z-value is 2.33. Since our calculated z-value (2.58) is greater than the critical value, we reject the null hypothesis and conclude that there is evidence to support the claim that the proportion of men who own cats is larger than 90% at the .005 significance level.
To test the claim that the proportion of men who own cats is larger than 90% at the .005 significance level, we can conduct a one-tailed hypothesis test. Our null hypothesis (H0) is that the proportion of men who own cats is less than or equal to 90%, while our alternative hypothesis (Ha) is that the proportion is greater than 90%.
We can use a z-test for proportions to calculate the test statistic and p-value. Let's assume we sample 200 men and find that 186 own cats. This gives us a sample proportion of 0.93.
Using the formula for the z-test for proportions, we get:
z = (0.93 - 0.9) / sqrt(0.9 * 0.1 / 200) = 2.58
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this time u get brainleist
Answer: 206
360 (full circle/angle) - 64 = 296
296 - 42 = 254
254 - 48 = 206
x = 206* GUYS THE ANSWER IS 206 not 360
6. Name three approaches for prevention (primary, secondary, and tertiary) for the following health problem/condition. (0.5 points) 1. COVID-19 infection
The three approaches for prevention (primary, secondary, and tertiary) for the COVID-19 infection.
1. Primary prevention: The primary prevention for COVID-19 infection includes measures such as promoting hand hygiene, wearing masks, maintaining physical distancing, and encouraging vaccination.
2. Secondary prevention: Secondary prevention for COVID-19 infection involves early detection and management of cases, including mass testing, isolation of confirmed cases, and contact tracing to prevent further spread.
3. Tertiary prevention: Tertiary prevention for COVID-19 infection focuses on minimizing the impact of the disease on individuals who have contracted it, through proper medical care, rehabilitation, and support services for those with long-term effects.
By following these three approaches, we can effectively prevent and manage the COVID-19 infection in our communities.
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question attached below pls help
Answer: (-1, 2)
Step-by-step explanation:
I really hope its right I'm sorry if it's wrong
PLEASE HELP!! l 50 points
Participants in a study of a new medication received either medication A or a placebo. Find P(placebo and improvement). You may find it helpful to make a tree diagram of the problem on a separate piece of paper.
Of all those who participated in the study, 70% received medication A.
Of those who received medication A, 56% reported an improvement.
Of those who received the placebo, 52% reported no improvement.
The probability of p(placebo and improvement) is 7.6%.
Here, we have,
Given that
Participants in a study of a new medication received either medication A or a placebo.
We have to find
The probability of P(placebo and improvement).
According to the question
Participants in a study of a new medication received either medication A or a placebo.
Let Probability that participants received medication A = P(M) = 0.80
Probability that participants received placebo = P(P) = 1 - P(M) = 1 - 0.80 = 0.20.
Because there are only two cases either medication A or a placebo.
Let I = event that there is an improvement.
Also, the Probability that participants reported improvement given that they had received medication A = P(I/M) = 0.76
The probability that participants reported no improvement given that they had received placebo = P(I'/P) = 0.62
So, Probability that participants reported improvement given that they had received placebo is,
= P(I / P) = 1 - P(I' / P) = 1 - 0.62 = 0.38
Now, Probability of (placebo and improvement) = Probability that participants received placebo times Probability that participants reported improvement given that they had received placebo.
P(placebo and improvement) = P(P) times P(I / P)
P(placebo and improvement) = 0.20 times 0.38 = 0.076 or 7.6%
Therefore, the required probability of p(placebo and improvement) is 7.6%.
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Samantha has 45 feet of material to make 12 scarves. Each scarf is to be the same length. Samantha uses this equation to find the amount of material she can use for each scarf. 45÷12=m How much material should she use for each scarf?
Samantha uses 3.75 feet of material to make each scarf if the total material used is 45 feet and she makes 12 scarves out of them.
Samantha has the total amount of material to make scarves is 45 feet. The total number of scarves made out of the material is 12. To calculate the material for one scarf we calculate it by dividing the total material by the number of scarves produced
Thus, Total material used = 45 feet
Number of scarves made = 12
Material for one scarf = 45 ÷ 12 = 3.75 feet
Thus, one scarf requires 3.75 feet of material.
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A building is 57 metres high. If this building has 19 floors, what is the height of each floor?
Each floor is 3 meter high.
We have,
A building is 57 metres high.
If this building has 19 floors.
Then, the height of each floor
= 57/ 19
= 3 m
Thus, Each floor is 3 meter high.
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The values in the table represent Function A and Function B.
Image_8695
Which statement about the 2
functions is true?
The statement that is true about the 2 functions, in which the relationship between the x and y-values in the table of values for both functions is a linear relationship is that The y-intercept of the graph of A is equal to the y-intercept of the graph of B
How to explain the functionThe equation representing the relationship in function A in point-slope form is therefore;
y - 12 = 6·(x - 2)
y - 12 = 6·x - 12
y = 6·x - 12 + 12 = 6·x
The equation in slope-intercept form, y = m·x + c, where c is the y-intercept is therefore; y = 6·x
The true statement is therefore; The y-intercept of the graph of A is less than the y-intercept of the graph of B
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What is the point-slope form of the line with slope −14 that passes through the point (−2, 9)? Responses y−9=−14(x+2) y minus 9 equals negative 1 fourth left parenthesis x plus 2 right parenthesis y−2=−14(x+9) y minus 2 equals negative 1 fourth left parenthesis x plus 9 right parenthesis y+2=−14(x−9) y plus 2 equals negative 1 fourth left parenthesis x minus 9 right parenthesis y+9=−14(x−2)
The point-slope form of the line with slope −14 that passes through the point (−2, 9) include the following: A. y - 9 = -14(x + 2), y minus 9 equals negative 1 fourth left parenthesis x plus 2 right parenthesis.
How to determine an equation of this line?In Mathematics and Geometry, the point-slope form of a straight line can be calculated by using the following mathematical equation (formula):
y - y₁ = m(x - x₁)
Where:
x and y represent the data points.m represent the slope.At data point (-2, 9) and a slope of -14, a linear equation for this line can be calculated by using the point-slope form as follows:
y - y₁ = m(x - x₁)
y - 9 = -14(x - (-2))
y - 9 = -14(x + 2)
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Question 1. What does a survey not help capture?Group of answer choicesa. Knowledge of individuals b. Everything a population knows c.Behaviors and Attitudes d. Perspectives of individuals2. Rita
A survey does not help capture:
(b) Everything a population knows.
A survey is a research method used to collect data from a sample of individuals or population through a series of standardized questions or measures, typically conducted through a questionnaire, interview, or online form. Surveys are commonly used in social science, marketing research, and other fields to gather information on a range of topics such as attitudes, opinions, behaviors, and demographics.
While surveys can provide information on knowledge, behaviors, and attitudes, they may not be able to capture the full perspective of individuals or their experiences. Surveys are limited by the questions asked and the way in which they are designed, so they may not always capture the nuances and complexities of a population's beliefs and experiences.
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You have 15 white balls arranged in a triangular arrangement. 7 balls are painted blue and 8 green.
Show that no matter how the balls are arranged, after they are painted, there will always be at least two blue balls that are adjacent to each other.
There will always be at least two blue balls that are adjacent to each other.
To show that no matter how the balls are arranged, after they are painted, there will always be at least two blue balls that are adjacent to each other, we can use the Pigeonhole Principle.
First, let's consider the worst-case scenario, which is when the blue balls are arranged such that they are as spread out as possible. In this case, we can imagine that the 15 white balls are arranged in a straight line, with 7 blue balls and 8 green balls interspersed in such a way that there are no two blue balls that are adjacent to each other.
Now, let's place each of the 7 blue balls in a pigeonhole that corresponds to their position in the line. Specifically, the first blue ball goes in the first pigeonhole, the second blue ball goes in the second pigeonhole, and so on, until the seventh blue ball goes in the seventh pigeonhole.
Since there are only 7 pigeonholes and 7 blue balls, at least one pigeonhole must contain two blue balls. And since the only way for two blue balls to be in the same pigeonhole is for them to be adjacent to each other in the line, we have shown that no matter how the balls are arranged, after they are painted, there will always be at least two blue balls that are adjacent to each other.
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When a polynomial function f is divided by x-c the remainder is
When a polynomial function f is divided by x-c, the remainder is given by the value of the polynomial function f evaluated at the value c. This result is known as the Remainder Theorem.
The result of dividing a polynomial function f(x) by x-c equals f(c), according to the theorem. Numerous branches of mathematics, such as algebra, calculus, and number theory, can benefit from this theorem.
It offers a straightforward and effective technique for computing remainders and comprehending how polynomial functions behave. The Remainder Theorem can be used to factor polynomials, factor complicated calculations, and solve equations with polynomial functions.
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in which hundredth interval of the number line does √(84) lie?
The hundredth interval of the number line in which √(84) is between 9.16 and 9.17
What is a numberline?A number line consists of a line marked with numbers at regular intervals that can be used for arithmetic calculations.
The hundredths interval n the number line in which √(84) can be located is found as follows;
√(84) = 2·√(21) ≈ 9.165
A hundredth is a value expressed to two decimal places, therefore, the hundredth on the number line in which the value 9.165 is located are the values larger than 0.16 but less than 0.17.
Therefore √(84) lies in between 9.16 and 9.17 on the number line
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20 divided into 6298729
y²+4y-7 evaluate the expression when y=7
The expression: y²+4y-7 when evaluated will give us 70.
Understanding quadratic equationQuadratic Equation is a polynomial equation of the second degree, which means that the highest power of the variable (usually x) is 2. It has the general form:
ax² + bx + c = 0
where a, b, and c are constants.
Note that a can never be zero otherwise it will turn to linear equation.
From the question given above:
y²+4y-7 when y = 7
y²+4y-7 = 0
7²+4(7)-7 = 0
= 49+28-7
= 70
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The mean pulse rate (in beats per minute) of adult males is equal to 68.9 bpm. For a random sample of 140 adult males, the mean pulse rate is 69.5 bpm and the standard deviation is 11.1 bpm. Complete parts (a) and (b). a. Express the original claim in symbolic form. b. Identify the null and alternative hypothesis.
The original claim in symbolic form is μ = 68.9 bpm, and the null and alternative hypotheses are H0: μ = 68.9 bpm and Ha: μ ≠ 68.9 bpm.
Let's break it down step by step.
a. Express the original claim in symbolic form:
The original claim is that the mean pulse rate of adult males is equal to 68.9 bpm. We can represent this claim using the following symbols:
μ = 68.9 bpm
b. Identify the null and alternative hypothesis:
The null hypothesis (H0) is the statement that the mean pulse rate of adult males is equal to the claimed value. The alternative hypothesis (Ha) is the statement that the mean pulse rate is different from the claimed value. In this case, the hypotheses can be written as:
H0: μ = 68.9 bpm
Ha: μ ≠ 68.9 bpm
To summarize, the original claim in symbolic form is μ = 68.9 bpm, and the null and alternative hypotheses are H0: μ = 68.9 bpm and Ha: μ ≠ 68.9 bpm.
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A random sample of 45 Hollywood movies made in the last 10 years had a mean length of 111.6 minutes, with a standard deviation of 14.3 minutes.
(a) Construct a 99% confidence interval for the true mean length of all Hollywood movies made in the last 10 years. Round the answers to one decimal place. A confidence interval for the true mean length of all Hollywood movies made in the last years is .
We can say with 99% confidence that the true mean length of all Hollywood movies made in the last 10 years is between 107.2 and 116.0 minutes.
We are given:
Sample size (n) = 45
Sample mean (x) = 111.6 minutes
Sample standard deviation (s) = 14.3 minutes
Confidence level = 99%
To construct the confidence interval, we can use the formula:
Confidence interval = x ± zα/2 * (s/√n)
Where:
x = sample mean
zα/2 = the z-score associated with the desired confidence level (in this case, 99% corresponds to a z-score of 2.576)
s = sample standard deviation
n = sample size
Substituting the given values, we get:
Confidence interval = 111.6 ± 2.576 * (14.3/√45)
Confidence interval = 111.6 ± 4.36
Confidence interval = (107.2, 116.0)
Therefore, we can say with 99% confidence that the true mean length of all Hollywood movies made in the last 10 years is between 107.2 and 116.0 minutes.
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Calculate the integral 0∫[infinity] te -⁵⁴ sin(t) dt using properties of Laplace transforms 0 (Hint: Realize the integral as a particular value of a certain Laplace transform.)
The integral has a value of 27.
To calculate this integral using Laplace transforms, we can first apply the Laplace transform to both sides of the equation:
L{0∫[infinity] t[tex]e^{(-54t)}[/tex] sin(t) dt} = L{0}
Using the property of Laplace transform for integration, we get:
[tex]L{te^{(-54t)} sin(t)} = -F'(s)[/tex]
where F(s) is the Laplace transform of sin(t).
Using the property of Laplace transform for differentiation, we can find F(s):
F(s) = L{sin(t)} = 1 / (s² + 1)
Now we can differentiate F(s) to find -F'(s):
-F'(s) = L{t [tex]e^{(-54t)[/tex] sin(t)} = (s² + 54) / (s² + 1)²
Finally, we can apply the inverse Laplace transform to get the solution:
0∫[infinity] [tex]te^{(-54t)[/tex] sin(t) dt = [tex]L^{-1}{(s^2 + 54) / (s^2 + 1)^2}[/tex]
Using partial fraction decomposition and inverse Laplace transform tables, we can simplify this expression to:
0∫[infinity] [tex]te^{(-54t)[/tex] sin(t) dt = (1/2) [cos(t) - 54 sin(t)] from 0 to infinity
Since cos(infinity) and sin(infinity) both do not converge, we can substitute infinity with a large value L and take the limit as L approaches infinity:
0∫[infinity] [tex]te^{(-54t)[/tex] sin(t) dt = (1/2) [cos(0) - cos(L) - 54(sin(0) - sin(L))] = 27
Therefore, the value of the integral is 27.
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