Ricardo dog weighs 6 times as much as his cat. the total weight of his two pets is 98 pounds. how much does richard dog weights?

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.

Can someone explain to me how to do

Which statements are true about additional information for proving that the triangles are congruent check all that apply