A, because 71-32 is equal to 39
C, because 85-46 is also equal to 39
D. 50
Thats because below sea level would be -50
so the oppisite would be 50 which is 50 feet above sea level
You want the (positive) distance when the height is 0, 0= -d^2 + 10d +5.
You would factor that out(You'd get radicals), and the final answer would be
<span>5±<span>30<span>−−</span>√</span></span><span>
You'd take the only positive one of the two, 5 + srt(30)
I hope I did that right :/</span>
