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October 25, 2014

October 25, 2014

Posted by **Henry** on Thursday, February 5, 2009 at 11:24pm.

- Pre-Calculus -
**Damon**, Friday, February 6, 2009 at 10:42amThe grade of an incline is its vertical rise in some units per every 100 horizontal run in the same units.

so

rise/run = tan slope = .12

so slope = tan^-1 .12 = 6.8 degrees

height in miles = .12 run in miles

( the question is ambiguous. I am assuming the 4 miles is on the map, horizontal, rather than on the odometer , hypotenuse)

height change = .12*4 miles = .48 miles down

or .48*5280 = 2534 feet down

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