the function f(t)=-16t^2+s0 represents the approximate height (in feet) of a falling object t seconds after its is dropped from an initial height s0 (in feet). A tennis ball falls from a height of 400 feet. a. after how many seconds does the tennis ball hit the ground? b. Suppose the initial height decreased by 384 feet. After how many seconds does the ball hit the ground?

answer:     true

step-by-step explanation:

6 spoons of sugar for every 21 cups of flour

step-by-step explanation:

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.