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Ilia_Sergeevich [38]

2 years ago

8

If a circle has a circumference of 4.6pi what is the area?

2 answers:

Brums [2.3K]2 years ago

8 0

Answer:

16.62

Step-by-step explanation:

formula for area of a circle is $\pi r^{2}$ 4.6 is the diameter and radius is 1/2 of diameter so $\pi 2.3^{2}$ is the equation

Alla [95]2 years ago

5 0

Answer:

r = 0.732 d = 1.46 C = 4.6

Step-by-step explanation:

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Joe measured the diameter of a tennis ball correct to the nearest millimetre. The upper bound of his measurement was 6.75 centim

Mandarinka [93]

The lower bound of the measurement is 65.5 millimetres.

A centimetre equals 10 millimetres, a measure is expressed by the <em>measured</em> magnitude plus uncertainty, the latter one represents the grade of precision of the measure instrument. That is to say:

$y = x + \epsilon$ (1)

Where:

$x$ - Measured magnitude, in millimeters.
$y$ - Possible magnitude, in millimeters.
$\epsilon$ - Uncertainty, in millimeters.

If we know that $y = 67.5\,mm$ and $\epsilon = 1\,mm$ , then the lower bound of the measurement is:

$y = 67.5\,mm - 2\cdot (1\,mm)$

$y = 65.5\,mm$

The lower bound of the measurement is 65.5 millimeters.

We kindly invite to check this question on measurements: brainly.com/question/4205362

4 0

3 years ago

what is the probability of seeing a sample mean for 21 observations less or equal to the sample mean that we observed

kramer

Answer:

$P(x \le 21) = 0.69146$

Step-by-step explanation:

The missing parameters are:

$n = 64$ --- population

$\mu = 20$ --- population mean

$\sigma = 16$ -- population standard deviation

Required

$P(x \le 21)$

First, calculate the sample standard deviation

$\sigma_x = \frac{\sigma}{\sqrt n}$

$\sigma_x = \frac{16}{\sqrt {64}}$

$\sigma_x = \frac{16}{8}$

$\sigma_x = 2$

Next, calculate the sample mean $\bar_x$

$\bar x = \mu$

So:

$\bar x = 20$

So, we have:

$\sigma_x = 2$

$\bar x = 20$

$x = 21$

Calculate the z score

$x = \frac{x - \mu}{\sigma}$

$x = \frac{21 - 20}{2}$

$x = \frac{1}{2}$

$x = 0.50$

So, we have:

$P(x \le 21) = P(z \le 0.50)$

From the z table

$P(z \le 0.50) = 0.69146$

So:

$P(x \le 21) = 0.69146$

4 0

3 years ago

Someone help ASAP please !! I’ll vote Brainliest !

alukav5142 [94]

Answer:

<u>2nd row</u>

Step-by-step explanation:

The y-intercept corresponds to the ordered pair having an x-value of 0. The second row of the table has an x-value of 0, and y-value of 2. Therefore, the y-intercept is (0, 2).

6 0

1 year ago

kow [346]

Answer:

the second one

Step-by-step explanation:

8 0

3 years ago

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san4es73 [151]

Can you please provide a picture to see if i can help you with the problem

6 0

3 years ago

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