Use Hooke's Law to determine the work done by the variable force in the spring problem. Seven joules of work is required to stretch a spring 0.5 meter from its natural length. Find the work required to stretch the spring an additional 0.30 meter. J Find the volumes of the solids generated by revolving the regions bounded by the graphs of the equations about the given lines y = x y = 4x - x (a) x-axis (b) y = 8 ca + Op Fu Sy Re Se 0! Ve Tri Gr