Need help I dont understand it

Ineed to learn how to solve this problem

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Acolony contains 1500 bacteria. the population increases at a rate of 115% each hour. if x represents the number of hours elapsed, which function represents the scenario? f(x) = 1500(1.15)" f(x) = 1500(115) f(x) = 1500(2.15) f(x) = 1500(215)