Algebra  word problem
posted by lindy .
A red ball and a green ball are simultaneously tossed into the air. The red ball is given an initial velocity of 96 feet per second, and its height, t seconds after it is tossed is (16t^2 + 96t) feet. The green ball is given an initial velocity of 80 feet per second, and its height, t seconds after it is tossed is (16t^2 +80t) feet.
1: Write the algebraic expression in simplest form that represents the difference in heights between the two balls at any time, t.
2: How much higher is the red ball after 2 seconds?

Your friend is taking an algebra class that began one week after ours. Explain to your friend how to graph linear inequalities with two variables