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t=(close to) 1.654 is what I got a.

I got t = 6.614
-16t^2 +1700 = 1000
-16t^2 = -700
t^2 = 43.75
then take square root of both sides

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1000=-16t^2+1700
-700=-16t^2
_/-700=_/-16t^2
26.458/16=16t/16
t=1.654
is what I did

You need to divide by 16 first, before you take the square root.

Okay got a. and b. now I just need c.:)

1700=16t^2
_/-106.25=t^2
t=10.3078
Is what I got for how long it takes to hit the ground.

Cool. So the a reasonable domain is from 0 to 10.3078.

Thank you that helped a lot! I have one more question to post can you help me with it?

sure, I'll look for you.

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