Factor completely: 2x2 − 18

prime

2(x2 − 9)

2(x + 3)(x − 3)

2(x + 3)(x + 3)

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.

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]