Please do help me with this calculus problems pleaseee. I need the correct letter of the answer and the complete solution. Please please. I promise to give a perfect score as a feedback...

5. Is f f(x)g(x)dx_ converges? A. always B. sometimes C. never D. frequent 6. It is volume of the solid generated by a region bounded by the vertical lines x=a and x=b, which is revolved about the y-axis (vertical axis of revolution so the radius is equal to x, is 2nfa x f(x) dx and radius r=x. A. washer method B. disk method C. cylindrical method D. shell method 7. In region bounded by y = x, y = 4 , x = 0 rotated about the y-axis, what is the best applicable method in solving its volume? A. washer method B. disk method C. cylindrical method D. shell method8. Hydrostatic pressure in a liquid at a given depth d and this can be calculated using the hydrostatic equation: P = p g d, where P is the pressure, p is the velocity of the liquid, g is gravity (9.8 m/s^2) and d is the depth (or height) of the liquid. A. false B. true C. not sure D. none of the above 9. Evaluate whether the integral J_ 74 2 converges or diverges? A. - , converges B. - , diverges C. - " , converges D. none of the above 10. Calculate the areas of the segments contained between the x-axis and the curve y = x (x - 1)(x - 2). A. 1/2 sq.units B. '4 sq. units C. 1 sq. units D. O sq. units