Asked by Anonymous

back from break, need help again

The height , h, in feet, of a bottle rocket is modeled by:

where t is the time in seconds.

A. Factor the expression.

H = -16t^2 + 60t = 4t(-4t + 15)

B. What is the height of the rocket after 2 seconds?

When t = 2
H = 4t(-4 times 2 + 15) = 28

C. What is the height of the rocket after 3.75 seconds? Explain the solution.

When t = 3.75

H = 4t(-4 times 3.75 + 15) = 0?

(when I try to calculate this I get 0 and that can't be right, I'm doing something completely wrong I think)
Answered by Anonymous
Forgot to post the Modeled by part: h = -16t^2 + 60t
Answered by Scott
B. calculation error

C. zero is correct
... the rocket has to come back down at some point
Answered by Anonymous
What was the error in my calculation on B?
Answered by Scott
it's fairly obvious ... troubleshoot it ...
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