( 5x2 - 4)-(3x2 + 8x + 4)

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.

Can someone check my answer? you : )

Which representation has a constant of variation of -2.5