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2 years ago

HELP please answer both questions

Mathematics

2 answers:

ExtremeBDS [4]2 years ago

7 0

Answer:

6.28in and 62.8m

Step-by-step explanation:

C = d(3.14)

C = 2(3.14) = 6.28

C = 20(3.14) = 62.8

Anastaziya [24]2 years ago

5 0

Answer:

1) 6.28

2) 62.8

Step-by-step explanation:

Multiply pi by the diameter to get the circumfrence.

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Diego deposited $5,000 at a rate of 6.25 % for 20 years . Find the simple interest and amount of money Diego had in the bank aft

sammy [17]

Answer:

First find the rate for a year .

5000 dollars × 6.25 = 31 250

After you find it multiply it by 20 ( because there are 20 years)

31 250 × 20 = 625000

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2 years ago

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What is the coefficient in the term k?<br> A.0<br> B.1<br> C.2<br> D.k

DaniilM [7]

Answer:

Step-by-step explanation:

because the is an invisible 1 in an letter

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2 years ago

Can someone help me in this algebra question please 100% correct

Artist 52 [7]

The answer is the 3rd choice. The beginning temperature is -9 so you add the 7 to the -9 degrees to find the temperature at noon because it increased.

7 0

3 years ago

5. David Read's the problem:

vladimir1956 [14]

Answer:

No, David's answer does not seem reasonable.

Let x= original purchase amount

25x = $10.25, so solve for x by dividing both sides by .25, and you get x = $41.

If the shirt was $18, the shorts must have been $41-$18 = $23 NOT $41.

Step-by-step explanation:

7 0

3 years ago

A simple random sample of 50 items from a population with 7 resulted in a sample mean of 35.

Vilka [71]

The 90% , 99% confidence interval for the population mean is 32.145 < $\rm \mu$ < 35.855 and 31.093 < $\rm \mu$ < 36.907

<h3>What is Probability ?</h3>

Probability is the study of likeliness of an event to happen.

It is given that

Total Population = 50

Mean = 35

The confidence interval is given by

$\rm CI = \mu + z \dfrac{s}{\sqrt n}$

$\rm \mu$ is the mean

z is the confidence level value

s is the standard deviation

n is the population width

(a) The 90% confidence interval for the population mean

90% $\rm \alpha / 2$ = 0.05

Z = 1.64

34 $\rm \pm$ 1.64 * 8 / √50

34 $\rm \pm$ 1.855

32.145 < $\rm \mu$ < 35.855

(b) The 99% confidence interval for the population mean

99% $\rm \alpha / 2$ = 0.005

Z=2.57

34 $\rm \pm$ 2.57 * 8 / √50

34 $\rm \pm$ 2.907

31.093 < $\rm \mu$ < 36.907

Therefore the confidence interval for population mean has been determined.

The complete question is

A simple random sample of 50 items from a population width =7 resulted in a sample mean of 35. If required, round your answers to two decimal places.

a. Provide a 90% confidence interval for the population mean

b. Provide a 99% confidence interval for the population mean

To know more about Probability

brainly.com/question/11234923

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8 0

2 years ago