Question

The cost, c, 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

$\\ \sf\longmapsto c=1.29r$

• cost is 1$

$\\ \sf\longmapsto 1=1.29r$

$\\ \sf\longmapsto r=\dfrac{1}{1.29}$

$\\ \sf\longmapsto r=0.7$

• Cost of 0.7 rolls is 1

Cost of 1 roll

$\\ \sf\longmapsto \dfrac{1}{0.7}$

$\\ \sf\longmapsto \dfrac{10}{7}$

$\\ \sf\longmapsto 1.4$