What is the radius of a circle whose circumference is 16π?
A. 32π
B. 16
C. 8 π
D. 8

D

Step-by-step explanation:

Remark

The circumference of a circle is 2 * pi * r

Given

The circumference (C) = 16 * pi

Solution

2 pi r = 16 pi                                       Divide by 2*pi

r = 16 pi / (2*pi)

r = 8

is there answer choices?

there are many solutions.

step-by-step explanation:

step 1: simplify both sides of the equation.

4x+6=4x^2+10x−4

step 2: subtract 4x^2+10x-4 from both sides.

4x+6−(4x^2+10x−4)=4x^2+10x−4−(4x^2+10x−4)

−4x^2−6x+10=0

step 3: factor left side of equation.

−2(2x+5)(x−1)=0

step 4: set factors equal to 0.

x=-5/2 or x=1