Find the volume of the solid of revolution formed by rotating about the x--axis the region bounded by the given curves.
f(x)=2/√x+2, y=0, x=-1, x=2.

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.