The function f(x) = -0.3x2 + 2.5x + 5 can be used to approximate the distance a thrown ball is from the ground, where x is

the distance between the ball and the person throwing the ball. The mathematical domain of the function is all real

numbers.

The reasonable domain of the function is when 0

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

ratio is 2 : 9

the answer is three

13.5 : 3

b, i believe, but not sure.