0.42 inches per foot.
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about 1.58
2% grade is equal to a 1/4" per foot fall
2 degrees 56 minutes 53 seconds
No. 3 ft is equal to 36 inches. There are 12 inches per foot.
"Rise per run" or something like that is the tangent function. Use your scientific calculator to calculate tan 30. Be sure to set your calculator to degrees first. Then - since you want the result in inches per foot - multiply this tangent by 12.