MATH
posted by math pro .
test tomm so plz reply back fast
a concrete bridge over a river has an underside in the shape of a parabolic arch. At water level, the arch is 30 mwide. it has maximum heigt of 10m above the water. the minimum vertical thickness of the concrete is 1.5m.
1find the algebraic relation that represents the shape of the arch?
2what is the vertical thickness of the concrete 3m from the centre of the arch?
3if the water level rises 2m, how wide will the arch be at this new level?
can u plz explain each answer in detail as soon as possible plz

http://www.jiskha.com/display.cgi?id=1239932633
I know how to do your question, but I don't feel like doing so.
After all, I can do as I please. 
hahahaahah
thats k i figured it out 
Reiny  Point well taken!