I need some help with this question, not good at biology

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

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?

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)