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Rus_ich [418]
2 years ago
11

Diameter = 8 cm circumference =

Mathematics
2 answers:
adoni [48]2 years ago
7 0
The formula for circumference is π×r×r (r=radius) to get the radius you do diameter÷2= , in this case the radius is 4cm π×4×4= 50.26cm circumference
vivado [14]2 years ago
6 0


The formula to find circumference if you have diameter is:

pi multiplied by diameter.

So, 3.14*8= 25.12 cm

The circumference of the circle is 25.12 cm.

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Solve the equation: 3x + 5 = 17<br><br> Can you please help me?
Talja [164]

Answer: x=4

Step-by-step explanation: Look at pic below to see how solved.

7 0
3 years ago
Several years​ ago, 39​% of parents who had children in grades​ K-12 were satisfied with the quality of education the students r
BaLLatris [955]
<h2>Answer with explanation:</h2>

Let p be the population proportion  of parents who had children in grades​ K-12 were satisfied with the quality of education the students receive.

Given : Several years​ ago, 39​% of parents who had children in grades​ K-12 were satisfied with the quality of education the students receive.

Set hypothesis to test :

H_0: p=0.39\\\\H_a :p\neq0.39

Sample size : n= 1055

Sample proportion : \hat{p}=\dfrac{466}{1055}=0.441706161137\approx0.44

Critical value for 95% confidence : z_{\alpha/2}=1.96

Confidence interval : \hat{p}\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}

0.44\pm (1.96)\sqrt{\dfrac{0.39(1-0.39)}{1055}}\\\\0.44\pm0.0299536805135\\\\0.44\pm0.03\\\\=(0.44-0.03, 0.44+0.03)\\\\=(0.41,\ 0.47)

Since , Confidence interval does not contain 0.39.

It means we reject the null hypothesis.

We conclude that 95​% confidence interval represents evidence that​ parents' attitudes toward the quality of education have changed.

8 0
3 years ago
Lucy si thinking of a Numbers. The number is greater than two hundred twenty-five. Her number is less than 2 hundreds,2 tens, an
VikaD [51]
226 i believe, if not then idk
8 0
3 years ago
Find the area of the triangle
Mumz [18]

Step-by-step explanation:

\frac{(3 + 6) \times 4}{2}  =   \frac{9 \times 4}{2}   = 18 {m}^{2}

5 0
2 years ago
Multiply 4/5 by the reciprocal of −2/10.
Svetach [21]

Answer:

4/5*reciprocal of -2/10

The reciprocal of -2/10 is 10/-2

4/5*10/2

Cancelling the numbers

-4 is the answer

Step-by-step explanation:

I hope it will help you :)

7 0
3 years ago
Read 2 more answers
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