please help please i dont get it

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.

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab