Here is a picture of a math problem.

Which of the following situations represents a linear relationship? a. theresa increases the distance she runs by 0.1 miles every week. b. the volume of a box depends on the length of box. c. the amount of money in a bank account increases by 1 percent each year. d. the population of a town doubles every 5 years.

How many $20 bills do you need to have to make $280

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.