Please help, and please show work if you can <33

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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)