PLEASE HELP ME WITH THIS MATH TEST

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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

The graph of a function f(x)=(x+2)(x-4). which describes all of the values for which the graph is negative and increasing? all real values of x where x< -2 all real values of x where -2