1.  If 5a = 3125, then the value of 5(a - 3) is:

A. 25
B. 125
C. 625
D. 1625

Answer: Option A

Explanation:

5a = 3125 5a = 55

a = 5.

5(a - 3) = 5(5 - 3) = 52 = 25.