The fact I'm doing all my work but my teacher isn't grading it so i have a b now

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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.

How do you find principle and simple interest