Need help right answers 18

Trevor and marissa together have 26 t-shirts to sell. if marissa has 6 fewer tshirts that trevor, find hiw many tshirts trevor has. identify the if-than moves in your solution

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

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