Evaluate ab for a =2 3/4 and b = 4/5

What is the smallest integer n such that n\sqrt{2} is greater than 20

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

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)