(-7) by 90. what is the answer? please tell me

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

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?

Atype of plant is introduced into an ecosystem and quickly begins to take over. a scientist counts the number of plants after mmonths and develops the equation p(m)= 19.3(1.089)^m to model the situation. most recently, the scientist counted 138 plants.assuming there are no limiting factors to the growth of the plants, about how many months have passed since the plants werefirst introduced? a)o 6.1b)0.6.6c)10 72d)o 23.1