The cost, c,

Question

of paper towels, based on the number of rolls, r,
is given by this equation.

c=1.29r

What is the unit rate of the cost of the paper towels in dollars per roll?

Enter your answer as a decimal, like this: 42.53

Answer 1

To find the unit rate of the cost of the paper towels in dollars per roll, you need to divide the total cost by the number of rolls.

Given the equation: \[ c = 1.29r \]

The unit rate can be found by isolating the cost per roll, which is expressed as: \[ \text{Cost per roll} = \frac{c}{r} \]

Substituting the equation for cost: \[ \text{Cost per roll} = \frac{1.29r}{r} \]

When you simplify that, the \( r \) cancels out: \[ \text{Cost per roll} = 1.29 \]

Thus, the unit rate of the cost of the paper towels is \( 1.29 \) dollars per roll.

So the answer is: \[ 1.29 \]