Whats the best app to use to cheat on anything

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.