What is unit rates involving fractions?

20

Step-by-step explanation:

Let x be the number of cables.

Let y be the total cost.

Therefore,

West coast:  y = 4.39x + 38

East coast:   y = 3.14x + 63

if the total cost is the same, equate the equations and solve for x:

                  y = y

  4.39x + 38 = 3.14x + 63

4.39x - 3.14x = 63 - 38

            1.25x = 25

                   x = 25 ÷ 1.25 = 20

Therefore, the repair shop should purchase 20 cables for the total cost from each supplier to be the same.