In the expression
7a + b - 12
what is the coefficient of a?

What is the rate for one gallon of gasoline

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5