Two point five c = 15.75
if ur looking for what c is then you would divide 15.75 by 2.5 which is 6.3
\(\star\) \(2.5c=15.75\) \(\star\) \(2.5c/2.5=15.75/2.5\) \(Divide \ both \ sides \ by \ 2.5\) \(\star\) \(c=6.3\)