R' or also known as R-prime can, but doesn't always have to be the original R. It's there to show you that you can place any other alkane substitute in that place. You will probaby also stumble across R'' and even R''' or even more.
Rookie
the answer is r.
Sides on a Rectangle (or Rhombus)
like and as.
if r=5z and 15z =3 then r=10y
It would appear that r = y
Refined
· rotten
rewarding
Ritcheous
4 faces on Mount Rushmore
It equals R.