I need help here with explanation pleas

Which of the following will form the composite function?

Which equation represents h in the triangle? a) h = 6sin37° b) h = 10sin37° c) h = 6 10 sin37° d) h = 10 6 sin37°

How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60 mi/hr? the final answer is supposedly 21,609 but i have no idea how to get that, show work : )