about 1.58
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0.42 inches per foot.
2 degrees 56 minutes 53 seconds
No. 3 ft is equal to 36 inches. There are 12 inches per foot.
12 inches = 1 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.