please answer asap. sorry for asking so many questions today just have a test with over 100 questions:(

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

When the solutions to each of the two equations below are graphed in the xy-coordinate plane, the graphs of the solutions intersect at two places. write the y-cordninates of the points of intersection in the boxes below in order from smallest to largest. y=2x y=x^2-3