Desmos Graphing Calculator
Math·Advanced Math·Nonlinear functions
hardThe equation y=−4.9(x−8.9)2+12,400 gives the estimated height above ground, y, in meters, of a plane, where x is the number of seconds since it started a parabolic maneuver. If this equation is graphed in the xy-plane, which of the following is the best interpretation of the vertex of the graph?
A
The plane reached an estimated maximum height of 12,400 meters 4.9 seconds after it started the parabolic maneuver.
B
The plane reached an estimated maximum height of 12,400 meters 8.9 seconds after it started the parabolic maneuver.
C
The plane reached an estimated maximum height of 4.9 meters 12,400 seconds after it started the parabolic maneuver.
D
The plane reached an estimated maximum height of 8.9 meters 12,400 seconds after it started the parabolic maneuver.