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jacobballew2019
16.02.2020 •
Mathematics
The maximum grade allowed between two stations in a rapid-transit rail system is 3.5%. Between station A and station B, which are 270 ft apart, the tracks rise 8 and one half ft. What is the grade of the tracks between these two stations? Round the answer to the nearest tenth of a percent. Does this grade meet the rapid-transit rail standards?
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Ответ:
Part a) The grade is 3.2%
Part b) This grade meet the rapid-transit rail standard
Step-by-step explanation:
we know that
The formula of slope is "rise over run", where the "rise" (means change in y, up or down) and the "run" (means change in x, left or right)
In this problem we have
so
convert to percentage
Round to the nearest tenth of a percent
therefore
This grade meet the rapid-transit rail standard
Ответ:
The radius is half the length of the diameter.
The circumference is the perimeter of a circle.
To find the circumference, multiply Pi by the diameter.
Step-by-step explanation: