Suppose a railroad rail is 3 kilometers and it expands on a hot day by 18 centimeters in length. approximately how many meters would the center of the rail rise above the ground?

  16.43 meters

Step-by-step explanation:

If the shape of the rise is a triangle, then the center of it is half the total length from the end. We can find the rise (y) using the Pythagorean theorem:

  1500.09² = 1500² +y² . . . . .dimensions in meters

  270.0081 = y²

  y = √270.0081 ≈ 16.43 . . . . meters

About the most it would rise is 16.43 meters.

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If the shape is an arc of a circle, the height is about 14.2 meters.

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb