Question

practice

1. for karlas cellular phone service, she pays $100 per month plus $0.63 for each minute. karla received a bill for $289 last month. how many minutes did karla use?

Explanation:

Step1: Calculate the cost for minutes

The total bill is $289$, and the fixed cost is $100$. So the cost for minutes is $289 - 100$.
$$289-100 = 189$$

Step2: Calculate the number of minutes

Since each minute costs $0.63$, and the cost for minutes is $189$. Let the number of minutes be $x$. We have the equation $0.63x=189$. Solving for $x$ gives $x=\frac{189}{0.63}$.
$$x=\frac{189}{0.63}=300$$

Answer:

$300$ minutes.