Find the surface area of the sphere. Leave the answer in terms of π (The diameter is 18 yd).

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.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?