Aprepaid phone card has a credit of 200 minutes. write an expression for the number of minutes left on the card after t minutes have been used.

Step-by-step explanation:

This problem can be modeled by simple decreasing first order function.

This function has the following format

In which R(t) is the remaining time, in minutes, is the initial remaining time, and a is the angular coefficient of the function.

In your problem, the prepaid phone card has a credit of 200 minutes, so . At each minute, the amount of time remaining will decrease by 1, so the angular coefficient is 1, a = 1.

We are left with:

i believe the answer is d.

hope it you! : d

is means division by fractions

step-by-step explanation: