Write problem out please

21.25 m

Step-by-step explanation:

y = Ax² + Bx + C

Set the origin at the middle of the span so that the point (0, 0) is on the curve

0 = A(0)² + B(0) + C  means C = 0

The points (200, 85) and (-200, 85) are on the curve

85 = A(200)² + B(200)

85 = A(-200)² + B(-200)

85 - 40000A - B(200) = 85 - 40000A + B(200)

                      - B(200) = B(200)

                         -400B = 0

                                 B = 0

85 = A(200)²

A = 85/40000

y = 85x²/40000

y = 85(100)²/40000 = 21.25 m

what is the starting amount? the question is not clear sorry.

step-by-step explanation: