7(2c−5d)−3(d−2c) what’s this answer

Which of the following is the shape of a cross section of the figure shown below

Which of the following is the result of expanding the series

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)