PLEASE ANSWER!

Gabriel is building a roof for a shed. He uses plywood to make the roof with the dimension shown (rounded to the nearest tenth foot). But with an open bottom.

If it will cost $2.50 to cover one square foot with shingles, how much will it cost to cover the roof? Round to the nearest dollar.

$___

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.