Jimmy is going to buy a new bike. he can choose from a 10 speed bike, motor bike, or a tandem bike. his color choices are black, purple, blue, and silver. how many different combinations does jimmy have to choose from?
a: 3
b: 9
c: 12
d: 18

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.