Are x+2 (7-x) and x+20-3x equivalent?

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

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

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