Easy math

number 3 only
pls help

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.

Graph the equationy= x+3[tex]y = x + 3[/tex]

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25