Simplify the following expression.
-14x^2+9x-4x^2+5

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

Solve the system of equations. y= 2x y= x^2 - 15

Write an algebraic expression for the word expression the quotient of c and 8