Math Question
![Rui is a professional deep water free diver.
His altitude (in meters relative to sea level), \( \boldsymbol{x} \) seconds after diving, is modeled by:
\[
d(x)=\frac{1}{2} x^{2}-10 x
\]
How many seconds after diving will Rui reach his lowest altitude?
seconds](https://d3hlidq5bf9vg0.cloudfront.net/app-server-student/2022/3/18/90bb579d-de74-49de-b58c-a87532c0e1f4.png "Rui is a professional deep water free diver.
His altitude (in meters relative to sea level), \( \boldsymbol{x} \) seconds after diving, is modeled by:
\[
d(x)=\frac{1}{2} x^{2}-10 x
\]
How many seconds after diving will Rui reach his lowest altitude?
seconds")
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