(x^2-9)/(x+1) ÷ (x^2-6x+9)/(7x+7) reduced form?

a) 7(x-3)^2 b) 7(x+3) c) 7(x-3) d) 7(x+3)^2

x+3 x-3 x+3 x-3

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

Simplify. 3(4+4x) (type your answer in with no spaces)

What is the output, or dependent variable of quantity? 1: x 2: f(x) 3: y