Please find the volume in pi of a sphere with a surface area of 100pi

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Identify the slope an intercept of the following linear equation y = 1/5x - 6 a. slope: 1/5; intercept: -6 b. slope: 5; intercept: -6 c. slope: -1/5; intercept: 6 d. slope: 1/5; intercept: 6