Please solve 3 &4 but please do not take the answers pictures from other sites, I had this many times before. Thank you in advance.

3. In the last homework assignment, you computed the volume of the solid obtained by rotating the region inside $2 + (y 4)2 : 9 about the rataxis using the washer method. Set up, but do not evaluate, an integral for the volume of the solid of revolution using the shell method. 4. -Calculate the average value of each function over the given interval. Hint: use the identity tan2(x) = sec2(ac) 1 a) f(a: = :vtan2 a: , on the interval 0, E b g :3 = e, on the interval 0,4 3