3 years ago

How do you find the radius of a circle with a circumference of 12pi

Mathematics

1 answer:

sergejj [24]3 years ago

4 0

Answer:

Step-by-step explanation:

The circumference of a circle is $2\pir$ $\pi r$ , so $12\pi=2\pi r\\12=2r\\r=6$ . We can use this because the area of a circle is $\pi r^2$ . Thus, $\pi*6^2=36\pi$ .

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One hundred times the quantity five plus three

Maru [420]

Five-5

three-3

"the quantity five plus three" (5 + 3)

"one hundred times the quantity ..." means 100 (5 + 3)

now just solve 100(5+3)

solve the parentheses first (5+3) = 8

Now you are left with 100(8) or 100*8

when you solve your answer is 800

3 0

2 years ago

A researcher computes r = 0.45 using a sample of 18 participants. Is this Pearson correlation coefficient significant for a two-

Eduardwww [97]

Answer with explanation:

Given : The computed r -value = 0.45

Sample size : n=18

Degree of freedom : $df=n-2=18-2=16$

Now, the critical value for Pearson correlation coefficient for a two-tailed test at a .05 level of significance will be :

$r_c=0.468$ ( by critical correlation coefficient table)

Since , $r>r_c$ i.e. 0.45>0.468 , then we say that his Pearson correlation coefficient is not significant for a two-tailed test at a .05 level of significance.