You live near a bridge that goes over a river. The underneath side of the bridge is an arch that can be modeled with the function y = -0.000495x2 + 0.619x where x and y are in feet. How high above the river is the bridge (the top of the arch)? How long is the section of bridge above the arch?
A. The bridge is about 1250.51 ft above the river and the length of the bridge above the arch is about 193.52 ft
B. The bridge is about 193.52 ft above the river and the length of the bridge above the arch is about 1250.51 ft

Question

You live near a bridge that goes over a river. The underneath side of the bridge is an arch that can be modeled with the function y = -0.000495x2 + 0.619x where x and y are in feet. How high above the river is the bridge (the top of the arch)? How long is the section of bridge above the arch?
  A. The bridge is about 1250.51 ft above the river and the length of the bridge above the arch is about 193.52 ft 	
  B. The bridge is about 193.52 ft above the river and the length of the bridge above the arch is about 1250.51 ft

anonymous · Answer

looks so hard xD i hate math so much :(

anonymous · Answer

C. The bridge is about 1250.51 ft above the river and the length of the bridge above the arch is about 625.25 ft 	
  D. The bridge is about 193.52 ft above the river and the length of the bridge above the arch is about 625.25 ft

anonymous · Answer

lol i know me too

anonymous · Answer

@tgawade @rock_mit182

anonymous · Answer

To find top  of the  arch   first find the vertex   x =   -b /2a  
  then  plug that values  that is  x  in   equation   so we will get y = ------ft max  &    to find   How long is the section of bridge above the arch?
Find the 2 zeroes of the eqn. The straight line distance is the difference between the 2 zeroes.