An arched drainage culvert can be modelled by the function: y=(x(191-x))/60 if water fills the culvert to a height of 136.5 mm, use the quadratic formula to calculate how wide the air space is directly above the water level.

Substitute 136.5 for y.

Compare this equation with

a = 1, b = - 191, c = 8190

or

or

or

or

or

or

x = 126 or x = 65

Hence, the points on the curve are (65, 136.5) and (126, 136.5).

The width of the air space is the distance between these points.

Width =

=

= 126 - 65

= 61

Hence, width of the air space is 61m.

correct answer:

i^31 = -i

answer is : muchas/tipicas

have a nice day!

~recklesschicken