Posted by **Sam** on Thursday, February 3, 2011 at 4:48pm.

74. Road Grade

When driving down a mountain road, you notice warning signs indicating that it is a "12% grade." This means that the slope of the road is -12/100. Approximate the amount of horizontal change in your position if you note from elevation markers that you have descended 2000 feet vertically.

I'm stuck I don't get it can you help. Whay do I need to find? Should I divide 2000ft. and -.12 to find the horizontal change?

- Pre-Calculus -
**Reiny**, Thursday, February 3, 2011 at 5:34pm
slope is defined as rise/run

you are given a rise of 2000 ft, we don't know the run

so set up the ration 2000/run = 12/100

12run = 2000(100)

run = 200000/12 = 16 667 ft

- Pre-Calculus -
**Sam**, Thursday, February 3, 2011 at 6:16pm
Now I understand! Thank You So Much!!!

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