Consider the following formula used to find the volume of a cone.

v=πr²

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.

Which of the following is true for the relation f(x)=2x^2+1

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.