Help on my qestion plz!

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

For g(x) = 5x - 3 and h(x) = [tex]\sqrt{x}[/tex], find (g · h)(4)

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.