John sells hamburgers ($3) and cheeseburgers ($3.50). one afternoon he sells a total of 24 burger for $79. how many of these were hamburgers and how many cheeseburgers?

Adice is rolled 5 times. how many possible rolls are there? ( determine the number of outcomes using only the fundamental counting principal )

With #! i’ve tried to figure it out but i can’t.

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.