Hi I need help on what is the answer to this problems? Below is the question and other concerns will be in the comment section. I hope you can help me and surely I will give you full positive feedback

.

FIND THE VOLUME OF THE SOLID FORMED BY REVOLVING THE GIVEN AREA BOUNDED BY THE LINES AND CURVES, ABOUT A GIVEN AXIS OF ROTATION. 1. y = 3cos(x/2) the y axis and the x axis in the 15 quadrant revolved about the x-axis. 2. The area bounded by y=3x+4 and the curve y=x is revolved about the line x =5. 3. The area bounded by the curve y = x3 , x= 0 and y = 1 is revolved about the x axis