Please help me, i don't really understand it...

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct