4. A banner in the shape of an isosceles triangle is hung over the side of a building. The banner has a base of 30 ft (at the roof), a height of 20 ft, and weighs 50 lb. Write down an integral for the work required to lift the banner entirely onto the roof of the building.

i need assistance finding the dimensions on part C. Thank you!

A tank has the shape of an inverted circular cone with a radius of 4 feet and a height of 6 feet. if the tank contains 4 feet of gasoline find the work required to empty the tank through a pipe that extends 3 feet above the top of the tank. use 42.5 as the specific weight of the gasoline

5. If 15 ft-lbs of work is required to stretch a spring from its natural length of 6 in to a length of 12 in, how much work is required to stretch the spring from 9 in to 18 in? Include units in your final answer. Note: When work is measured in ft-lbs, distance is measured in feet.