Powers are repeated .

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Can any one me with the answers to these questions asap?