Answer
A, C, D, and E
Work Step by Step
Since the walkway rises 2.5 vertically for every 10 ft on the horizontal, the slope must be:
$slope=\frac{rise}{run}=\frac{2.5}{10}=\frac{1}{4}=0.25=25\%$
Thus all of these are correct answers:
A ($0.25$), C ($\frac{2.5}{10}$), D ($25\%$), and E($\frac{1}{4}$).
