For question 15 how do I find volume

Sho VLAODIV PDF w/o expl 15. CalC6b07a 10 pts possible Find the volume, V, of the solid obtained 7 Sh by rotating the bounded region in the first 7 cu. units quadrant enclosed by the graphs of 15 y = xi, r = y 0 2 V = NIP cu. units about the r-axis. O 3. V = 1 -7 cu. units N O 5 4. V -7 cu. units 12 O 5. 7 V cu. units 15 06. V cu. units 12