Represent the following expressions as a power of the number a (a≠0): a (a^3)^-2

Pls! does anybody know a shortcut for answering these types of questions in the future?

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.