2 (h+2) as coefficient

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.

Which of the following can be used to explain a statement in a geometric proof?

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25