The height of a ball, in feet, that is thrown straight up and fall straight down is modeled by the quadratic function y = −16(x-1)^2 + 21 where x is time, in seconds. at the time the ball is thrown, how high is it above the ground? the ball is thrown from 1 foot above the ground. the ball is thrown from the ground. the ball is thrown from 21 feet above ground. the ball is thrown from 5 feet above ground.

For this equation, you'll need to set x to 0 and solve from there.

First step is to solve the parentheses and then square the answer. Your equation will look like this:

Next, you will multiply -16 and 1, and then add the product of that by 21. Your answer will be

In short, the ball is thrown from 5 feet above ground.

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.