From this problem we have the following info given:
b= 45 represent the starting fee
m = represent the monthly payment
T= 285 represent the total cost after 10 months
x=10 represent the number of months
With this info we can create a function for the total cost like this:
![T\text{ = b + mx}](https://img.qammunity.org/2023/formulas/mathematics/college/84obcgqzm57z98vffyi5kfpeayrryc4nqk.png)
And replacing we have:
![285=\text{ 45 + 10m}](https://img.qammunity.org/2023/formulas/mathematics/college/yopbxoys54iomnqywfa8mjtd79c0k7gdk2.png)
If we solve for m we got:
![m\text{ = }(285-45)/(10)=24](https://img.qammunity.org/2023/formulas/mathematics/college/1cdjdwd9h03u2tvapse16jvq96dzigk9no.png)