Tell me the answers pls :)

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

Astrid spent $36 on new shoes. this was $12 less than twice what she spent on a new skirt. part a: which equation would solve for how much she spent on the skirt? part b: solve the equation in the workspace provided below. how much did astrid spend on her skirt?