Asked by Ed

Rui is a professional deep water free diver.
His altitude (in meters relative to sea level), xxx seconds after diving, is modeled by:
d(x)=1/2x^2 -10x

What is the lowest altitude Rui will reach?
I actually don't understand this problem if its asking for like the vertex or something if someone can please explain this and help me.

Answered by Scott
the function is quadratic (a parabola)

the lowest altitude (depth) is the vertex
Answered by Justin
60
Answered by Saira
-50
Answered by Abdirahman
10
Answered by Yuh
40
Answered by ki
10
Answered by travis
THE ANSWER IS -50
Answered by deebo samuel
answer is -50... i had this on my khan assignment and got it right
Answered by Tori (IM RIGHTTTT)
ITS TEN THEYRE ALL WRONG I JUST GOT IT RIGHT DO NOT PUT -50!!!
Answered by Kit
ITS 10
Answered by Sam
If you’re on khan academy the answer is -50
Answered by Kmai
The answer is 10 on khan
Answered by danielle
10
Answered by danny
-100 trust
Answered by Brandon
-50
Answered by tyler
10 and 50 are both right depending on what you are solving for. -50 is his depth and 10 is the seconds it takes him to get there.
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