Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of 21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ 𝑥 = −4.9𝑥2 + 21.3𝑥. About how many seconds will it take for the ball to hit the ground?

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Stephanie is a very good soccer player. She can kick a soccer ball with an initial velocity of 21.3 m/sec. The function that represents the height of the ball with respect to time is ℎ 𝑥 = −4.9𝑥2 + 21.3𝑥. About how many seconds will it take for the ball to hit the ground?

Mathematics
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\[h(x)=-4.9x^2+21.3x ?\] we want to know what x is when the ball hits the ground well when the ball hits the ground the height between the ball and the ground is 0 so you want to solve for x when h(x)=0
can you set the equation up and ill solve it pls @freckles

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so you are having trouble replacing h(x) with 0?
|dw:1435093451580:dw|
am I solving for x? @freckles
yes I think I said solve for x
let me scroll up I did :p
x is what you are solving for it is the time variable
ok I got x=0,4.34693878 @freckles
ok so at 0 sec the ball is on the ground and the ball is on the ground again after 4.347 secs

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