What is the radius of the circle whose area is numerically 5 times greater than its circumference?

a) 5
b) 10
c) 4 pi
d) 2 pi
e) pi

the answer is 10, why?

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

If 1/2+2/5s=s-3/4,what is the value of s? a. s=3/4 b. s=25/12 c. s=-25/12 d. s=-3/4

What is the domain of the given function? {(3,-2), (6, 1), (-1, 4), (5,9), (-4, 0); o {x | x= -4,-1, 3, 5, 6} o {yl y = -2,0, 1,4,9} o {x|x = -4,-2, -1,0, 1, 3, 4, 5, 6, 9} o y y = 4,-2, -1, 0, 1, 3, 4, 5, 6, 9}