Question

An inclined walkway leading to a new building is to rise 13 inches for each horizontal distance of 21 feet. Write this slope as a grade. (Round to the nearest tenth of a percent if necessary.)

Answer 1

tan(\alpha) = 13/21

Answer 2

so the grade \[\alpha\] is \[\alpha = \tan^{-1} (\alpha)\]

Answer 3

a. 61.9%
b. 1938.5%
c. 5.2%
d. 161.5%

Those are the Choices =)

Answer 4

my calculation gives 31.76°. so I am wrong... sorry....

Answer 5

That's alright honey! Thanks =)