Please help with questions 45, 46, 47, 48, & 38

Solve the following problems: 45. A closed box with a square base of side (x) and height (y) has a surface area of 100 sq. ft. a) Express the volume of the box as a function of x. V ( x ) = b) Domain of V (x) C) Range of V (x) 46. The area of the following trapezoid is 3012 cm2. 7 cm Find the exact value of x. 6 cm X 47. Water is poured into a conical container with a diameter of 20 cm and a height of 38 cm. If the volume of a cone is one-third of a cylinder, write an equation for the volume of water as a function of the height of the water in the container. 20 cm 38 cm\fFind the domain and range for the following functions. 38. f ( x ) = V9-x2, if 05x