Solve for b in the formula a = 1/2h(b+b)

1. what are the missing reasons in the proof 2. it's in the second picture and 3

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

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)