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2 years ago

Pls help me with this question it wold be great help its circumference

Mathematics

2 answers:

Anastaziya [24]2 years ago

7 0

The answer is circumference= 9.42m

Ivan2 years ago

6 0

Answer:

$C = 9.42\ m$

Step-by-step explanation:

The formula for the circumference of a circle with the diameter is:

$C = \pi d$

Since the diameter is 3m, solve for $C$ :

$C = \pi d\\C = \pi3\\C = (3.14) \times 3\\C = 9.42$

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Answer:

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Step-by-step explanation:

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4 years ago

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What is the math paper lesson 68

lapo4ka [179]

Do u mean from the book or something?

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3 years ago

Suppose the speeds of vehicles traveling on a highway are normally distributed and have a known population standard deviation of

ladessa [460]

Answer:

The margin of error for the confidence interval for the population mean with a 98% confidence level is 2.88 miles per hour.

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:

$\alpha = \frac{1-0.98}{2} = 0.01$

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 $1-0.01 = 0.99$ , so $z = 2.326$

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.

Find the margin of error for the confidence interval for the population mean with a 98% confidence level.

$M = 2.326*\frac{7}{\sqrt{32}} = 2.88$

The margin of error for the confidence interval for the population mean with a 98% confidence level is 2.88 miles per hour.

5 0

3 years ago

One year, the population of a city was 201,000. Several years later it was 237,180. Find the percent increase.

exis [7]

Answer:

18%

Step-by-step explanation:

% increase = new population - old population x 100

old population. 1

% increase = 237180 - 201000 x 100

201000. 1

% increase = 36180 x 100

201000

% increase = 3618000

201000

% increase = 18%

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2 years ago

A boat goes 24 miles at a constant speed in 4 hours against a river current.

Ne4ueva [31]

Answer:

8 miles per hour.

Step-by-step explanation:

24miles in 4 hours = 24/4=6 miles per hour.

24 miles in 3 hours = 24/3=8 miles per hour. The boat going with the current of the river is traveling at 8 miles per hour.

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3 years ago