Answer:
1 unit
Step-by-step explanation:
The arch has the shape of an inverted parabola.
It intersects the x-axis (the ground) at the roots of the equation
-13(x - 5)(x - 6) = 0
Since the equation is already factored, we solve the equation by setting x - 5 equal to zero and x - 6 equal to zero and solving the equations.
x - 5 = 0 or x 6 = 0
x = 5 or x = 6
The roots of the equation are x = 5 and x = 6.
The width is the distance between x = 5 and x = 6.
6 - 5 = 1
The width of the arch at the ground is 1 unit.
