anonymous
  • anonymous
if an object is projected from a height of 640ft with an initial velocity of 96ft per second, it's height after 't' second is given by the follow equation : h=-16t^2+196t+640 after how many seconds is the height 784? [hint: let h=784]
Mathematics
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SOLVED
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katieb
  • katieb
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FortyTheRapper
  • FortyTheRapper
Basically, you just plug in 784 for h to get 784 = -16t^2+196t+640 Let's take it one step at a time. How would you move the 640 from the right side of the equal sign to the left?
anonymous
  • anonymous
subtract 640 from both side right? 784=-16t^2+196t+640 -640 -640 ---------------------- 144=-16t^2+196t
FortyTheRapper
  • FortyTheRapper
Yes! Since the opposite of addition is subtraction. Now for the next step, the 196t. The 196t is showing multiplication. What would you do to get that t alone?

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anonymous
  • anonymous
would you divide the 196 from the equation? 144=-16t^2+196t ----------------- 196

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