The height, h, of a cylinder is 5 units less than 3 times its radius, r. which expression represents the height of the cylinder in terms of its radius?
a. 5-3r
b. 3r-5
c. 5h-3r
d. 3r-5h

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?