[In this question the unit vectors i and j are due east and due north respectively.] A coastguard station O monitors the movements of a small boat. At 10:00 the boat is at the point ( 4i−2j) km relative to O. At 12:45 the boat is at the point ( −3i−5j) km relative to O. The motion of the boat is modelled as that of a particle moving in a straight line at a constant speed. Calculate the speed of the boat, giving your answer in kmh−1 (3 marks)​

The value of a in the right triangle is 5

From the question, we have the following parameters that can be used in our computation:

The right triangle

Using the pythagoras theorem, we have

(leg₁)² + (leg₂)² = (hypotemuse) ²

Substitute the known values in the above equation, so, we have the following representation

(a + 1)² + (a + 3)² = (a + 5)²

When evaluated, we have

a = 5

Hence, the value of a is 5

Read more about right triangles at

https://brainly.com/question/2437195

#SPJ1

The point estimator of the mean percentage of airline reservations canceled on the day of the flight is the midpoint of the 95% confidence interval, which is (3% + 9%) / 2 = 6%.

The point estimator of the mean percentage of airline reservations being canceled on the day of the flight is the midpoint of the confidence interval, which is (3% + 9%) / 2 = 6%. Therefore, the point estimator of the mean percentage of reservations that are canceled on the day of the flight is 6%.

This means that based on the data, we can estimate that the mean percentage of airline reservations being canceled on the day of the flight is around 6%. However, since this is a point estimate, there is some uncertainty associated with it. The 95% confidence interval provides a range of values within which we can be 95% confident that the true mean percentage of cancellations falls. In this case, we can be 95% confident that the true mean percentage of cancellations on the day of the flight falls between 3% and 9%.

Overall, the interval and the point estimator provide us with useful information about the mean percentage of airline reservations being canceled on the day of the flight and allow us to make informed decisions and predictions about future cancellations.

Know more about 95% confidence interval here:

https://brainly.com/question/15683202

#SPJ11

The probability of choosing the first chip a white, then the second chip, not Black is 2/15.

The probability of choosing the first chip a white, then the second chip, not Black is determined as follows:

There are a total of 10 chips, 4 whites, and 6 blacks

The probability of choosing the first chip, a white = 4/10 or 2/5

Then without replacement, there are now 3 white chips and 6 black chips.

The probability of not choosing a black is the probability of picj=king another white chip

Probability of another white chip = 3/9 or 1/3

Therefore;

P(white and not a black) = 4/10 * 1/3

P(white and not a black) = 4/30

P(white and not a black) = 2/15

Learn more about probability at: https://brainly.com/question/24756209

#SPJ1

Complete question:

Suppose a bag contains 4 white chips and 6 black chips. You randomly choose one of the chips. Without replacing the first chip, you choose a second chip. Find the probability of choosing the first chip a white, then the second chip, not a Black.

4/45

1/10

2/25

1/9

Answer:

Total amount ≈ $115,952.40 (rounded to 2 decimal places)

Step-by-step explanation:

To calculate the total amount Kyle will pay over 30 years, we need to first determine his annual mortgage payment. We can use the mortgage formula to do this:

M = P * r * (1 + r)^n / ((1 + r)^n - 1)

Where:

M = monthly mortgage payment

P = principal loan amount (in this case, $40,000)

r = monthly interest rate (annual interest rate / 12)

n = total number of payments (loan term in years * 12)

In Kyle's case:

P = $40,000

Annual interest rate = 9% = 0.09

r = 0.09 / 12 = 0.0075

Loan term = 30 years

n = 30 * 12 = 360 payments

Plug these values into the formula:

M = 40,000 * 0.0075 * (1 + 0.0075)^360 / ((1 + 0.0075)^360 - 1)

M ≈ $322.09 (rounded to 2 decimal places)

Now that we have the monthly mortgage payment, we can calculate the total amount paid over 30 years:

Total amount = Monthly mortgage payment * number of payments

Total amount = $322.09 * 360

Total amount ≈ $115,952.40 (rounded to 2 decimal places)

So, Kyle will pay approximately $115,952.40 over 30 years for his mortgage.

Answer:

-13 < x < 13

Step-by-step explanation:

let base, b = 11

side, a = 7

missing side, hypotenuse, c = x

according to the phythagoras theorem,

a² + b² = c²

7² + 11² = c²

49 + 121 = c²

170 = c²

thus, third side = +- 13

Answer:

undetermined

you need more info, what does x equal?
This is only true if x=0

If comparing means of two groups with equal sample sizes, always use a paired test. The statement is false.

A paired test is used when each observation in one sample is paired with a corresponding observation in the other sample. This pairing can occur naturally (e.g. before and after treatment in a clinical trial) or can be done by matching subjects based on relevant characteristics. Paired tests have greater power to detect differences between groups because they account for the individual variability in the observations and reduce the influence of extraneous factors that affect each observation similarly. However, they are only appropriate when there is a natural pairing or matching of observations. If the samples are independent, meaning that the observations in one sample are not paired with the observations in the other sample, then a paired test is not appropriate. In this case, an independent sample t-test is used to compare the means of the two groups. The sample size does not determine whether a paired test or an independent sample t-test should be used; rather, it depends on the nature of the observations and the research question being investigated.

Learn more about paired test here:

https://brainly.com/question/29675440

#SPJ11

The experimental probability of selecting a card with an A is 1/10

From the question, we have the following parameters that can be used in our computation:

Number of times = 30

Number of times A is selected = 3

using the above as a guide, we have the following:

P(A) = A selected/Total

So, we have

P(A) = 3/30

Evaluate

P(A) = 1/10

Hence, the probability is 1/10

Read more about probability at

https://brainly.com/question/24756209

#SPJ1

Answer:

2a) The standard error is given by:

SE = sqrt[(s1^2/n1) + (s2^2/n2)]

  = sqrt[(5.10^2/16) + (5.23^2/16)]

  = 2.32

2b) The test statistic is given by:

t = (x1 - x2) / SE

 = (45.13 - 48.69) / 2.32

 = -1.53

2c) The p-value for a two-tailed test with alpha = 0.05 and degrees of freedom = 30 (n1 + n2 - 2) is 0.1384.

2d) Since the p-value (0.1384) is greater than the level of significance (0.05), we fail to reject the null hypothesis that there is no difference in the cost of high end red and white wines. Therefore, we cannot conclude that there is a significant difference in the cost of high end wines.

The domain of the relation given by the graph is {-5, -2, -1, 0, 1, 5}.

Given a graph.

Here x represents the independent variable and y represents the dependent variable.

Domain of a relation is the set of all independent variables for which the relation is defined.

Here domain is the set of all values of x.

We have the points marked on the graph as,

(-5, 1), (-2, 0), (-1, -1), (0, 2), (1, 3), (5, 1).

Here domain is the set of all x values.

Domain = {-5, -2, -1, 0, 1, 5}

Hence the correct option is A.

Learn more about Domain here :

https://brainly.com/question/13113489

#SPJ1

The value of the identities is sin O = -2/5. Option D

From the information given, we have that;

sec O = 5/3

Then, we have;

Hypotenuse = 5

adjacent = 5

Note that in the fourth quadrant only cosecant and secant identities are positive unlike in the first quadrant were all the identities are positive, then, we have;

cos O = adjacent/hypotenuse

substitute the values, we have

cos O = -3/5

Substitute the values, we get;

For the sine identity

sin O = -2/5

Hence, the ratio is -2/5 for sine identity

Learn about trigonometric identities at: https://brainly.com/question/7331447

#SPJ1

The probability of drawing a jack of spades on the first draw and a black card on the second draw is 13/1326.

The probability of drawing a jack of spades from a standard deck of playing cards is 1/52 since there is only one jack of spades in the deck of 52 cards.

Once the jack of spades has been drawn, there are 51 cards left in the deck, of which 26 are black (13 clubs and 13 spades) and 25 are red (13 diamonds and 12 hearts).

The probability of drawing a black card as the second card, given that the first card was the jack of spades, is 26/51.

Now the probability of both events occurring, we multiply the probabilities of the individual events:

P(jack of spades and second card is black) = (1/52) x (26/51)

= 13/1326

To learn more on probability click:

https://brainly.com/question/11234923

#SPJ1

Answer: (4x+7)-(x+1) = 4x + 7 - x - 1 = 3x + 6.

Therefore, (4x+7)-(x+1) = 3x + 6.

Step-by-step explanation:

Answer:

Step-by-step explanation:

1. Distribute the Negative sign

(4x +7 ) + (-x - 1)

2. Remove Paranthesis

4x + 7- x - 1

3. Solve

4x - x + 7 - 1

3x + 6

4. (optional) Factor out the 3

3(x+2)

The answer is 3x + 6 or 3(x+2)

The given equation in standard form can be written as (x - 1)² + (y + 3)² = 5².

The given equation is as follows;

x² - 2x + y² + 6y = 15

(x² - 2x) + (y² + 6y) = 15

(x² - 2x + 1 - 1) + (y² + 6y) = 15

The first three terms inside the parentheses can be factored as a perfect square:

(x - 1)² - 1 + (y² + 6y) = 15

(x - 1)² - 1 + (y² + 6y + 9 - 9) = 15

The first three terms inside the second set of parentheses can be factored as a perfect square:

(x - 1)² - 1 + (y + 3)² - 9 = 15

Combining like terms and simplifying, we get:

(x - 1)² + (y + 3)² = 25

So, the equation in standard form is:

(x - 1)² + (y + 3)² = 5²

Therefore, the center of the circle is at (1,-3) and the radius is 5.

Learn more about the equation in standard form here:

https://brainly.com/question/29089139

#SPJ1

The position of the particle at t=1 second is 11 meters.  To find the position of the particle at t = 1 second, we need to integrate the acceleration function to get the velocity function and then integrate the velocity function to get the position function.

a(t) = 20t^3 + 12t^2

Integrating with respect to t:

v(t) = 5t^4 + 4t^3 + C1

Using the initial velocity condition v(0) = 4 m/s:

4 = 0 + 0 + C1

C1 = 4

So, the velocity function is:

v(t) = 5t^4 + 4t^3 + 4

Integrating with respect to t:

s(t) = (5/5)t^5 + (4/4)t^4 + 4t + C2

Using the initial displacement condition s(0) = 5 m:

5 = 0 + 0 + 0 + C2

C2 = 5

So, the position function is:

s(t) = t^5 + t^4 + 4t + 5

Finally, to find the position of the particle at t = 1 second:

s(1) = 1^5 + 1^4 + 4(1) + 5 = 11

Therefore, the position of the particle at t = 1 second is 11 m.

Learn more about meters here:

https://brainly.com/question/29367164

#SPJ11

The future value of the annuity due is $1,848.20, rounded to the nearest cent.

To find the future value of an annuity due of $1,000 paid at the beginning of each 6-month period for 5 years, we can use the formula:

[tex]FV = Pmt x ((1 + r/m)^n - 1) x (1 + r/m)[/tex]

where:

Pmt is the payment amount, which is $1,000 in this case

r is the interest rate per year, which is 6%

m is the number of compounding periods per year, which is 2 since interest is compounded semiannually

n is the total number of compounding periods, which is 10 since there are 5 years and interest is compounded semiannually

(1 + r/m) is the interest factor

Substituting the values, we get:

[tex]FV = $1,000 x ((1 + 0.06/2)^10 - 1) x (1 + 0.06/2)[/tex]

= $1,000 x [tex](1.06^{10[/tex] - 1) x 1.03

= $1,000 x 1.79155 x 1.03

= $1,848.20

Therefore, the future value of the annuity due is $1,848.20, rounded to the nearest cent.

To learn more about compounded visit:

https://brainly.com/question/19458442

#SPJ11

The constant of proportionality for Vic at the hardware shop is found to be $0.49 per bolt sold.

To find the constant of proportionality, we need to divide the total amount earned by the number of bolts sold in the hardware shop.

Let's first calculate the price per bolt:

Price per bolt = Total amount earned / Number of bolts sold

Price per bolt = $70.56 / 144 bolts

Price per bolt = $0.49 per bolt

Now, we can see that for every bolt sold, the price is $0.49. Therefore, the constant of proportionality is $0.49 per bolt.

To know more about constant of proportionality, visit,

https://brainly.com/question/27598477

#SPJ4

To solve the problem, we can use the formula for compound interest:

A = P(1 + r/n)^(n*t)

where A is the final amount, P is the principal (initial deposit), r is the interest rate (as a decimal), n is the number of times interest is compounded per year, and t is the time (in years).

In this case, P = $8,100, r = 0.05, n = 1 (compounded annually), and t = 4. Plugging these values into the formula, we get:

A = $8,100(1 + 0.05/1)^(1*4)

A = $8,100(1.05)^4

A = $10,563.23

Therefore, Priscilla will earn $10,563.23 - $8,100 = $2,463.23 in interest over the next 4 years.

The polygons are similar with similarity ratio of 1.5, respectively

To check if the polygons are similar, we divide corresponding sides and check if the ratios are equal

So, we have

Rectangle

So, the similarity ratio is 1.5

Triangle

So, the similarity ratio is 1.5

Read more about  similar shapes at

https://brainly.com/question/14285697

#SPJ1

Answer:

Perpendicular

Given the following vectors:

[tex]\vec u =-5 \hat i +8 \hat j\\\vec v =56 \hat i +35 \hat j\\[/tex]

We are asked to determine whether vectors u and v are parallel or perpendicular.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

How do we do this?

To determine whether two vectors are parallel, the result of their cross product is zero.

To determine whether two vectors are perpendicular, the result of their dot product is zero.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[tex]\bold{Given \ two \ vectors...}\\\vec a=a_x \hat i + a_y \hat j +a_z \hat k\\\\\vec b=b_x \hat i + b_y \hat j +b_z \hat k\\[/tex]

[tex]\bold{Cross \ Product} \Rightarrow \vec a \times \vec b= \begin{vmatrix}\hat i & \hat j & \hat k\\a_x & a_y & a_z\\b_x & b_y & b_z\end{vmatrix} \rightarrow \begin{vmatrix}a_y & a_z \\b_y & b_z \end{vmatrix} \hat i- \begin{vmatrix}a_x & a_z \\b_x & b_z \end{vmatrix} \hat j+\begin{vmatrix}a_x & a_y \\b_x & b_y \end{vmatrix} \hat k[/tex]

[tex]\bold{Dot \ Product} \Rightarrow \vec a \cdot \vec b = a_xb_x+a_yb_y+a_zb_z[/tex]

Note: The result of the cross product is a vector while the result of a dot product is a scalar.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cross product:

[tex]\vec u \times \vec v = \begin{vmatrix}\hat i & \hat j & \hat k\\-5 & 8 & 0\\56 & 35 & 0\end{vmatrix}[/tex]

[tex]\Longrightarrow \begin{vmatrix} 8 & 0 \\ 35 & 0 \end{vmatrix} \hat i- \begin{vmatrix}-5 & 0 \\56 & 0 \end{vmatrix} \hat j+\begin{vmatrix}-5 & 8 \\56 & 35 \end{vmatrix} \hat k[/tex]

[tex]\Longrightarrow [(8)(0)-(0)(35)]\hat i -[(-5)(0)-(0)(56)]\hat j +[(-5)(35)-(8)(56)] \hat k[/tex]

[tex]\Longrightarrow (0)\hat i (0)\hat j +[-175-448] \hat k[/tex]

[tex]\Longrightarrow (0)\hat i (0)\hat j +(-623) \hat k[/tex]

[tex]Thus, \ \boxed{\vec u \times \vec v = 0\hat i + 0\hat j -623 \hat k}[/tex]

Which does not equal zero. So, these vectors aren't parallel.

Now, dot product:

[tex]\vec u \cdot \vec v = (-5)(56)+(8)(35)+(0)(0)[/tex]

[tex]\Longrightarrow \vec u \cdot \vec v = -280+280+0[/tex]

[tex]Thus, \ \boxed{ \vec u \cdot \vec v = 0}[/tex]

The dot product of vectors u and v equals zero. These vectors are perpendicular!

Answer:

The biconditional statement p <-> q is true when p and q have the same truth values and is false otherwise.

Step-by-step explanation:

This is because the biconditional is saying "p if and only if q"

A biconditional statement, written as "p if and only if q" or "p <--> q," is only true when both p and q have the same truth value. In other words, if p is true, then q must also be true for the biconditional statement to be true. Likewise, if p is false, then q must also be false.

Therefore, a biconditional statement is only true when the two statements being compared have equivalent truth values. A biconditional statement, represented as p ↔ q, is only true when both p and q have the same truth values. In other words, it is true when:

1. p is true and q is true, or
2. p is false and q is false.

A biconditional essentially means "p if and only if q." If both statements are true or both statements are false, then the biconditional is true. If one statement is true and the other is false, then the biconditional is false.

To learn more about Equivalent - brainly.com/question/14672772

#SPJ11

The response rate for this survey was 4.2% (1727 completed out of 41,000 invited), rounded to one decimal place. Using the quick method, the estimated margin of error for a random sample of size 1727 is approximately 2.4%. The margin of error is a good measure of the accuracy of the survey's results because the number of non respondents was large, which may have introduced bias into the sample. However, the fact that the sample was randomly selected is a good indication of the survey's accuracy. The fact that only 33% of responding mothers said they communicate at least once a day with their child while at school does not necessarily invalidate the margin of error as a measure of accuracy, as the margin of error is based on the size of the sample, not on the specific results of the survey.

To calculate the response rate, divide the number of completed surveys (1727) by the number of parents invited (41,000) and multiply by 100 to get a percentage.

Response rate = (1727/41,000) * 100
Response rate ≈ 4.2%

To estimate the margin of error, use the quick method formula:

Margin of error ≈ 1 / √(sample size) * 100

Margin of error ≈ 1 / √(1727) * 100
Margin of error ≈ 2.4%

Considering the margin of error, it is not a good measure of the accuracy of the survey's results, because the number of non respondents was large.

To learn more about response rate : brainly.com/question/15875828

#SPJ11

The formula you provided is used to calculate the required sample size for a two-tailed test with a confidence level of 95%.

The condition for using this formula is that the sample size is not given and needs to be determined. This formula is not a derivative of any other formula, but rather a standalone equation used in statistics to determine sample size.

In the case where you want to determine the required sample size for a two-tailed test without a given value for 'n', you can use the formula n = (Z(α/2) + Z(β))² * (σ1² + σ2²) / Δ². The condition is a two-tailed test, meaning you are testing for the possibility of a relationship in both directions. This formula is a derivative of the more general sample size calculation for hypothesis testing, adjusted specifically for two-tailed tests. In your example, it appears that some values or symbols may be incorrect, so please double-check the information and let me know if you need further assistance.

Learn more about derivative at: brainly.com/question/25324584

#SPJ11

In addition to telling us at what percentile a given score (or mean) falls, Z scores tell us (B) how extreme the difference is.

Z scores are a standardized measure of how far a data point or sample mean deviates from the population mean in standard deviation units. In addition to telling us at what percentile a given score or mean falls, Z scores also tell us how extreme the difference is. A high positive or negative Z score indicates that the data point or sample mean is far from the population mean, while a low Z score indicates that the data point or sample mean is close to the population mean.

However, Z scores do not tell us whether our results are due to chance or not. To determine whether our results are significant, we need to calculate a p-value, which tells us the probability of obtaining a sample as extreme as ours by chance alone. If the p-value is below a predetermined threshold (usually 0.05), we can conclude that our results are statistically significant and not just due to chance.

Therefore, the correct answer is B: Z scores tell us how extreme the difference is, but they do not provide evidence for or against the hypothesis that our results are due to chance or that our data is different from a population. Additional statistical tests are needed to make such conclusions.

Learn more about Z scores here: https://brainly.com/question/28096232

#SPJ11

Answer:

Step-by-step explanation:

The answer is B because it goes 7,9,9,9,10,12,14,14,16 The number in the middle is the median(10) 4 on each side so second number from the front is your Q1 (9) second number from the back is your Q2 (14) smallest number is 7 and biggest nimber is 14 so that is your min. and max. so your answer is D

The value of x in the similar triangle is 12 units. The triangle are similar because they only vary in sizes but have the same shape.

Two triangles are said to be similar if their corresponding angles are congruent and the corresponding sides are in proportion .

The triangles are also similar because they have the same shape but different sizes.

Hence, let's find the value of x as follows:

3 / 9 = 4  / x

cross multiply

3x = 36

divide both sides by 3

x = 36 / 3

x = 12

Therefore, the value of x is 12 units.

learn more on similar triangle here: https://brainly.com/question/14926756

#SPJ1

There are 82 people you should survey if you want to know, at a 98% confidence level, that the sample mean SAT score is within 50 points of the true mean SAT score.

We have,

a college board sample estimated the standard deviation of 2016 SAT scores to be 194 points.

We used the formula,

= x ± Z (α/2) × σ/√n

Here, α = 1 - 98% = 0.02

Z (α/2) = Z (0.02/2) = 2.326

Hence, We get;

Z (α/2) × σ/√n = 50

2.326 x 194 /√n = 50

√n = 2.326 x 194 / 50

n = 82

Therefore, There are 82 people you should survey if you want to know, at a 98% confidence level, that the sample mean SAT score is within 50 points of the true mean SAT score.

Learn more about the standard deviation visit:

https://brainly.com/question/475676

#SPJ12

The domain of the function f(x)=−1/2x⁵ is found to be all natural number and the range is all real number using leading coefficient and degree method.

The end behavior of the function f(x) = -(1/2)x⁵ can be determined using the leading coefficient and degree. The leading coefficient is -1/2, which is negative. The degree of the polynomial is 5, which is odd. As a result, we may deduce that the function's final behavior is as follows,

The value of the function f(x) approaches negative infinity as x approaches negative infinity. This indicates that when x travels to the left, the graph of the function declines without bound.

The value of the function f(x) approaches positive infinity as x approaches positive infinity. This indicates that when x travels to the right, the graph of the function grows without bound.

The domain of the function f(x) is all real numbers. Because the function f(x) may take on any feasible value of y, its range is all real numbers.

To know more about leading coefficient and degree, visit,

https://brainly.com/question/28310448

#SPJ4

The area of the square enclosure is calculated as Area = AB² = 5² = 25 square units.

To find the length of the fourth side of the square, find the distance between points C(7,4) and D(x,y). AB and CD are parallel and perpendicular to each other, so they have the same length. Hence,

AB = CD = √((4-0)² + (0-3)²) = 5

Using this distance to find coordinates at point D:

D(x,y) = A(0,3) + (-5,-5) = (-5,-2)

Now to find the length of each side of the square:

AB = CD = √((4-0)² + (0-3)²) = 5

BC = AD = √((7-4)² + (4-0)²) = 5

Therefore, the area of the square enclosure is:

Area = AB² = 5² = 25 square units.

Find out more on area here: https://brainly.com/question/25292087

#SPJ1

Answer:

Horizontal label

Step-by-step explanation:

Horizontal label has numbers going from the bottom to the top from 0 to 100.