What is the solution set of the equation x/5 + x/2=14

What properties allow transformation to be used as a problem solving tool

We just started the introduction into circles and i have no idea how to do this.

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)