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 " $ 1.29 per roll " .

Step-by-step explanation:

Given:  C = (1.29) r ;

We are asked to find the cost of one rol,l;

in dollars per single roll.

Since "r" refers to "number of rolls" ;

Let "r" be equal to "1" ; and solve for "C" ;

  C = (1.29) r ;

     = (1.29)*(1) ;

     = (1.29) .

The answer is:  " $ 1.29 per roll " .

Hope this is helpful!

Best wishes!

true, hope this helps

Step-by-step explanation: