Suppose a railroad rail is 3 kilometers and it expands on a hot day by 20 centimeters in length. approximately how many meters would the center of the rail rise above the ground

Center of the rail rise above the ground in 17 m.

Solution:

The railroad rail is 3 km = 3000 meter

It expands 20 cm = 0.2 meter on hot day in length

So it will form a triangle with base 3000 m and the equal sides will be

Let us assume that the center of the rail will raise x meter.

So using Pythagoras theorem,  

Taking square roots on both sides we get,

So, the rail raise 17 meter from the ground .

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

80 the answer is 80

step-by-step explanation: