No because if you convert them into a percentage, you get 11/15 as 73.3% and 1/2 is 50%. Hope this helps
4r^2=4 if r=1
2s^3=250 if s=5
I believe yo meant c=2pir but ok
c=2r
divide both sides by 2
c/2=r
if you forgot tthe pi
c=2pir
divide by 2pi
c/(2pi)=r
