Please answer fast urgently ​

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

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.

Factor and solve to find roots x squared -x - 90 =0