Question

How would you find the formula to rent a video for 3 days at $10

Answer 1

You would find the formula to rent the video game for
$10 for per day so you would pay $30 total for all three days.
If its $10 for 3 days the total price is $10

If you need me to explain more let me know and i will Just let me know if your meaning $10 per day or if its $10 for 3 days
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Answer 2

v=number of videos, x=total amount
10v*3=x
Since each video is $10, you would have to multiply that by the number of videos. Once you find that you would multiply that number by three, since you will be keeping the videos for 3 days. With that you will find, x, the total amount.