Expenses that are bi-weekly are paid a) every two weeks b) twice a week c) every two months d) twice a month

Car salesmen in ads use the term bimonthly to mean payments are to be made twice a month. So biweekly would mean twice a week.

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80