The shape of an entrance to a tunnel can be modeled by the graph of the equation y = -0.2x(x - 20) where x and y are measured in feet. On a coordinate plane, the ground is represented by the x-axis. How wide is the tunnel at its base? Explain how you found your answer.

GAMEMASTERX40  Apr 7, 2018

Since we know it is an upside down parablola, the two points where it crosses the x axis (where y=0) will define the width


y = 0 = -0.2 x  (x-20)       means   x = 0    and x = 20   are the places where it crosses the x-axis (ground level)

distance between 0 and 20 = 20 ft

ElectricPavlov  Apr 7, 2018

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