The circumference of a circle is 20 π.what is the radius of this circle

The correct option is 10

Step-by-step explanation:

The formula of circumference of the circle is:

C = 2πr

where C is the circumference of the circle

r = radius

In this question we have given the circumference and we have to find out the radius:

Thus substitute the values in the formula:

C = 2πr

20π= 2πr

Move 2π to the L.H.S.

20π/2π = r

Cancel out π by π and 20/2 by the table of 2

Therefore we have:

10=r

Thus the correct option is 10

Answer is provided in the image attached.

the equation of the parallel line would be y = 2x + 9

step-by-step explanation:

to start we need to find the slope of the original line. we can do that by looking at the coefficient of x, which is 2

since the slope of the original line is 2 and parallel lines have the same slope, we know the new line will also have 2 slope. now we can use that along with the point given in point-slope form to get the find equation.

y - y1 = m(x - x1)

y - 5 = 2(x + 2)

y - 5 = 2x + 4

y = 2x + 9