Can someone help me with these problems?

Question 1:

A variable force of 7x-2 p ft - lb pounds moves an object along a straight line when it is x feet from the origin. Calculate the work done in moving the object from x = 1 ft to x = 13 ft. (Round your answer to two decimal places.)A force of 12 lb is required to hold a spring stretched 2 in. beyond its natural length. How much work W is done in stretching it from its natural length to 4 in. beyond its natural length? W = ft-lbIf the work required to stretch a spring 3 ft beyond its natural length is 15 ftlb, how much work is needed to stretch it 18 in. beyond its natural length? :anb A circular swimming pool has a diameter of 16 ft, the sides are 6 ft high, and the depth of the water is 5 ft. How much work (in ftelb) is required to pump all of the water out over the side? (Use the fact that water weighs 62.5 lb/fta. Round your answer to the nearest integer.) |:lft-Ib A spring has a natural length of 26.0 cm. If a 24.0-N force is required tn keep it stretched to a length cf 40.0 cm, how much work W is required to stretch it from 26.0 cm tn 33.0 cm? (Round your answer to three decimal places.) ME]