Question

Julie has a basic cell phone plan that costs $70 each month for 500 minutes, plus $0.40 for each additional minute, m. Last month,her bill was over $90. Model Julie's situation with an inequality, and solve for m.What can be interpreted about the solution of the inequality?A.More than 20 additional minutes were used.В.More than 50 additional minutes were used.C.Less than 20 additional minutes were used. D.Less than 50 additional minutes were used.

Answer 1

In this problem we can write an equation that relate the total cost (y) and the number of minutes (x) so in this case will be:

$y=0.40x+70$

So if last month she pay $90 dollars then:

$\frac{20}{0.4}=50$

So he spend 50 additional munutes so is B)