Your answer should be $45.50, you can also look up the answer on google if you need to
No, Perry is not using the correct ratio, because 15:17 is not equivalent to 5:7
15 divided by 3 is indeed 5 but divided 17 by 3 does not give you 7, nor a whole number.
I hope this helps.
The way your problem is set it should be simplified to this....4x + 55
In cylindrical coordinates, the equations of the surfaces become

These surfaces intersect on the cylinder of radius 1 with cross sections parallel to the x,y-plane:

Then in cylindrical coordinates, the volume of the space bounded by these surfaces is
