Someone please help thank youu

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2