4-5 need help asap !!

4. If the work required to stretch a spring 10m is 100J, then the first step necessary to find k is: 3 pts a) Convert m to cm b) Integrate kx c) Divide 100 J by 10m d) Convert J to N from 0 to 10 5. A solid is generated by rotating the shaded region in the figure below about a line. Match each formula to the line of rotation. Indicate whether each formula represents the washer or shells method. 8 pts 12 1. 0.8 y = Vx 0.6- 0.4 y = x2 0.2 0.2 0.4 0.6 0.8 1. 1.2 X Line of Rotation Formula Method Volume Formula X-axis A ) [ TE [ ( 1 - x 2 ) 2 - ( 1 - Vie ) ] dx X =1 B ) 2nex ( Vx - x2) dx C ) |7 ( x - x4 ) dx y-axis D ) 2 7 ( 1 - x ) ( V X - x 2 ) dx y = 1