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ch4aika [34]
3 years ago
7

What is the circumference of the circle shown below?​

Mathematics
2 answers:
Wittaler [7]3 years ago
7 0
I think the answer is D but in not sure
antoniya [11.8K]3 years ago
7 0
<h3>tema</h3>

\bold{CIRCUMFERENCE  \: OF \:  THE  \: CIRCLE}

  • The circumference of a circle is the distance around the outer edge of a circle. With other shapes, we can find the perimeter of the circle. The perimeter is the distance around a polygon. Circles are not polygons because they are not made of line segments.

----------------------------------------------------------------------------------------------

\bold{P=2 \times  \pi \times r}

\bold{P=2×3.14×19.50}

\bold{P=6.28  \times 19.50}

\bold{P=122.46}

----------------------------------------------------------------------------------------------

\boxed{ \boxed{ \boxed{ \bold{c. \red{122.4 \: cm}}}}}

⭐----------------------------------------------------------------------------------------------⭐

\bold{BRAINLYMENTALMENTE}

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Write 34% as a fraction in simplest form
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Answer:

The answer is that the simplest fraction form of 34% is 17/50

Step-by-step explanation:

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34% = 17/50

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2 years ago
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A Cell Phone company sells cellular phones and airtime in a State. At a recent meeting, the marketing manager states that the av
GarryVolchara [31]

Answer:

The null hypothesis is rejected.

There is enough evidence to support the claim that the average age of the customers differs from 40 years.

The sample does not support the manager claim (the average age seems to differ from 40 years).

Step-by-step explanation:

This is a hypothesis test for the population mean.

The manager claims that the average age of customers is 40 years. As this is an equality, we will test if the average age differs from 40. If the null hypothesis failed to be rejected, the claim of the manager is right.

Then, the claim is that the average age of the customers differs from 40 years.

Then, the null and alternative hypothesis are:

H_0: \mu=40\\\\H_a:\mu\neq 40

The significance level is 0.05.

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The sample mean is M=38.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=7.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{7}{\sqrt{50}}=0.99

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{38-40}{0.99}=\dfrac{-2}{0.99}=-2.02

The degrees of freedom for this sample size are:

df=n-1=50-1=49

This test is a two-tailed test, with 49 degrees of freedom and t=-2.02, so the P-value for this test is calculated as (using a t-table):

P-value=2\cdot P(t

As the P-value (0.049) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the average age of the customers differs from 40 years.

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Answer:

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Step-by-step explanation:

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Answer

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Step-by-step explanation:

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2 years ago
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