use the shell method to write and evaluate the definite integral that represents the volume of the solid generated by revolving the plane region about the y-axis.

6. 1 = + 1 -X 28. y = C C = 314. y =1-c 4 -1 -24 18. y = y22. y = c+2, 1=0, 1=24. y = y= 0, =4, about the line * = 6\f28. y =4-ex 5- - -3-2 -1 310 30. y = 1=0, c=1, c=5