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3 years ago

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Leonardo draws a cookie on graph paper using the scale shown below. The cookie has a diameter of 12.5 cm in the drawing. Which o

f the following drawings best represents the diameter of the cookie at the scale Leonardo chose?

1 answer:

____ [38]3 years ago

7 0

Answer:

Where's the drawing at because I don't see anything man

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A supplier of a certain car parts chain of stores wants to estimate the average length of time car owners plan to keep their car

____ [38]

Answer:

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.575*\frac{6.5}{\sqrt{25}} = 3.35$

The lower end of the interval is the sample mean subtracted by M. So it is 7.2 - 3.35 = 3.85 years

The upper end of the interval is the sample mean added to M. So it is 7.2 + 3.35 = 10.55 years

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

7 0

3 years ago

Tony and Jasmine have a total of 140 pictures. Jasmine and Wenjun have a total of 260 pictures. Given that Wenjun has five times

kupik [55]

Answer:

30

Step-by-step explanation:

T+J = 140

J+W = 260

W= 5T

T+J = 140

5T+J = 260

T+J+120 = 5T+J

120=4T

T=30

J= 110

W=150

6 0

3 years ago

Show answer in lowest terms.3/4 + 8/9

DiKsa [7]

3/4 + 8/9

= (3*9)+(4*8) / (4*9)

= 27+32 / 36

= 59/36

= 1 23/36

7 0

3 years ago

Read 2 more answers

For the function f(x, y) please sketch the level curves of the function, nd then list the domain and the range of the function,

Zepler [3.9K]

Answer: Domain is open

Step-by-step explanation: the question is incomplete. See the complete question in the attached file and the solution.

Thanks

3 0

3 years ago

Determine the number of ways of placing the numbers $1, 2, 3, \dots, 9$ in a circle, so that the sum of any three numbers in con

solmaris [256]

Answer:

144 ways

Step-by-step explanation:

The arrangements to have the sum of three numbers being divisible by three can be approached by modular arithmetic such that the difference between the third integer and the sum of the first two integers is divisible by 3 making them congruent modulus 3

We have;

With the first number as 1

The second number can be 2, 5 or 8

The third number can then be 3, 6, 9

The fourth number can then be 4 or 7

The sixth number can be 3, 6, 9

The seventh number can be 4 or 7

The eight number can be 2, 5, 8

and the ninth number can be 3, 6, 9

Therefore, we have

the first number as 1

The second, fifth, and eight number can be 2, 5 or 8

The third, sixth and ninth number can then be 3, 6, 9

The fourth, and seventh number can then be 4 or 7 Which gives,

The number of possible arrangements for the numbers 2, 5, and 8 = 3! = 6

The number of possible arrangements for the numbers 3, 6, and 9 = 3! = 6

The number of possible arrangements for the numbers 4, and 7 = 2! = 2

he total number of possible arrangements = 2×6×6 =72

The arrangement can be reversed in the counter clockwise directions given the total number of ways of placing the numbers 1, 2, 3,..., 9 in a circle, so that the sum of any three numbers in consecutive positions is divisible by 3 = 72 × 2 = 144 ways.

7 0

3 years ago

Read 2 more answers