Find the missing side length pls help

Geometry answer picture question pls . reason and statements

Bill works as a waiter and is keeping track of the tips he ears daily. about how much does bill have to earn in tips on sunday if he wants to average $22 a day? tips by day tips (dollars) monday tuesday wednesday thursday friday saturday $14 $22 $28 $36

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8