The elevation of a toy glider chamges by -19.5 centimeters in 3 seconds

What is the value of f(x) = 2.2 for f(-2)?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?