Please help i will give extra points

Match each function with the corresponding function formula when h(x)=5-3x and g(x)=-3+5

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882