8 times what gives me 16

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.