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anonymous
 5 years ago
A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=16t^2+144t. For what time period is the projectile at least 288 ft off the ground?
anonymous
 5 years ago
A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=16t^2+144t. For what time period is the projectile at least 288 ft off the ground?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Plug in 288 for h, move it over to the right side and do the quadratic formula to solve for t. You will get 2 times, in between and including those times will give you the period it is at least 288 ft off the ground.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so you end up with an equation like this 0=16t^2+144t288??

radar
 5 years ago
Best ResponseYou've already chosen the best response.0You can simplify this and not need to use the quadratic. \[288=16t ^{2}+144t\] Divide through by 16 getting 18=t^2 + 9t

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so you end up with 3 and 6?

radar
 5 years ago
Best ResponseYou've already chosen the best response.0\[t ^{2}9t+18=0\] Is what you would get after rearranging the equation Now you have something you can easily factor. Hi Raslk2kl1

radar
 5 years ago
Best ResponseYou've already chosen the best response.0Yes now I don't know if that means it was above 288 feet for the time 3 thru 6 seconds or not. can you figure that out

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes, the way I enter the answers seems like it is between 3 and 6 seconds
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