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plss help???

ok... do you know to differentiate..?

no lol what is that?

ok... do you know how to find the line of symmetry of the curve...?

no

what answer did you get got the distance spanned by the bridge..?

1,780.851

oops missed a digit it should be 0.837/0.000471 and you should get 1777.07

is it the line that goes down the middle?

thats it...

so how do i figure it out?

soooo divide 1777.07 by 2?

yep... then substitute it...
the highest point is at the centre of the acrch

which equation?

the original equation
0.000471x^2 + 0.837x

okay so when i divided it by 2 i got 888.535..... which number do i sub that for in the equation?

thats correct...

so do i sub that in for x?

yes
so its
\[-0.000471\times(888.535)^2 + 0.837\times888.535\]

so it's D

what did you get for the height..?
the length is 1777.07

371.85

ok... which answer has height 371.85 and length 1777.07

thats it.. well done

yes... you have all the answers you need
height = 371.85 and length 1777.07