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2 years ago

The button on Madelyn's jacket has a radius of 4 millimeters. What is the button's circumference?

Mathematics

1 answer:

BigorU [14]2 years ago

8 0

Answer:

The circumference would be 25.12 mm

Step-by-step explanation:

$c = 2\pi r$

$c = 6.28 \times 4$

$c = 25.12$

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Please Answer ASAP <br> Math Question

MArishka [77]

If you were to factor you would do what my teacher likes to call reverse foil so it would look like this (x-9)(x+4) so what you do is you brainsrorm to see what multiplies what to get that and 9*4=36 so that is how you factor -36 to find the -9 Hope this helps if I'm correct if not I will try to find the answer

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3 years ago

Will give brainlist

viktelen [127]

Answer:

See explanation.

Step-by-step explanation:

A terminating decimal is a decimal that has an end.
A repeating decimal is a decimal fraction in which a number, or a group of numbers, is repeated indefinitely.
Most repeating decimals contain a nine in the denominator, when written in fraction form.
Both can be written in fraction form.
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2 years ago

Will mark brainliest, what are the missing numbers?

Delvig [45]

Answer:

117

Step-by-step explanation:

Got it from calucaltor and did it to make sure

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2 years ago

Read 2 more answers

Please find the value of x in the figure

notka56 [123]

Answer:

Step-by-step explanation:

E is the midpoint of Ac & D is the midpoint of AB

DE = (1/2)BC {Midpoint theorem}

$x +1 = \dfrac{1}{2}(4x - 6)\\\\\\
Multiply \ the \ whole \ equation \ by 2\\\\
2*(x+1) =2*\dfrac{1}{2}*(4x - 6)$

2*x + 2*1 = 4x - 6

2x + 2 = 4x - 6

Add 6 to both sides

2x + 2 + 6 = 4x

2x + 8 = 4x

Subtract 2x from both sides

8 = 4x - 2x

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Divide both sides by 2

x = 8/2

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8 0

2 years ago

A certain test preparation course is designed to help students improve their scores on the USMLE exam. A mock exam is given at t

e-lub [12.9K]

Answer:

$17.67-2.92\frac{2.517}{\sqrt{3}}=13.427$

$17.67+2.92\frac{2.517}{\sqrt{3}}=21.913$

So on this case the 90% confidence interval would be given by (13.427;21.913)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the mean and the sample deviation we can use the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (2)

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$ (3)

The mean calculated for this case is $\bar X=17.67$

The sample deviation calculated $s=2.517$

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=3-1=2$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,2)".And we see that $t_{\alpha/2}=2.92$

Now we have everything in order to replace into formula (1):

$17.67-2.92\frac{2.517}{\sqrt{3}}=13.427$

$17.67+2.92\frac{2.517}{\sqrt{3}}=21.913$

So on this case the 90% confidence interval would be given by (13.427;21.913)

6 0

2 years ago