Multiply by 1.8 (9/5) and add 32
Answer: the sum of five times a number x and two
Answer:
about 17 meters
Step-by-step explanation:
We can use the Pythagorean theorem to put an upper bound on the height of the bump in the rail. This assumes half the expanded rail length (d+e) is the hypotenuse of a right triangle whose legs are the bump height (b) and the 2500 meter distance (d) from the center of the rail to its end.
The Pythagorean theorem relates these distances this way:
b^2 + d^2 = (d+e)^2
Expanding the square on the right, we can simplify the expression to find b.
b^2 = (d^2 +2de +e^2) -d^2
b^2 = e(2d +e)
b = √(e(2d +e))
Using lengths in meters, we can fill this in to calculate b.
b = √(.06(2·2500 +.06)) = √300.0036
b ≈ 17.32 . . . . meters
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<em>Comment on this solution</em>
We don't expect rails to tear loose from the rail bed and rise up to a height matching that of a 3-story building. That is why there are typically expansion joints and shorter rail lengths used in the construction of railways.
The height is a little lower if we take physics into account and distribute the stress in the rail along its length. No doubt the final curve is somewhat more complicated than the triangle we have assumed.
If it were an ellipse, the height might only be 9.4 meters, with the steepest rise occurring near the ends of the rail. The math for this model is beyond the scope of this answer.
Answer:
56
Step-by-step explanation:
Answer:
y=(-6/5)x+8.6
Step-by-step explanation:
If a line is perpendicular to 5x-6y=9, then it must have a slope that is the negative reciprocal.
1) Fine the slope of the first line by setting the equation equal to y.
5x-6y=9
5x-9= 6y
(5/6)x-1.5=y
slope= 5/6
2) Find the negative reciprocal of the slope
slope: 5/6
reciprocal: 6/5
negative reciprocal: -6/5
3) We now get to use the points (-3, 5) by plugging them into slope-intercept form. The goal is finding the y-intercept.
y=mx+b
5=(-6/5)(-3)+b
5=(-18/5)+b
5= -3.6+b
b= 8.6
4) Now we put everything back in slope-intercept form.
y=(-6/5)x+8.6
