Someone help plz make sure it’s right?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1