SOLUTION: help https://imgur.com/a/5vtx1k2

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Question 1182237: help
https://imgur.com/a/5vtx1k2
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
.
Replace h by 8 and solve for t:

h=4%2B18t-16t%5E2

8=4%2B18t-16t%5E2

16t%5E2-18t%2B4=0

Use the quadratic formula to finish:

t+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

If you get stuck, I'll help you.  Tell me
in the message space below.

Edwin