360/n

4

The resulting equation is inversely proportional (not proportional, like a baking recipe). So, set up a proportional equation and then flip one of the sides. It is important to use the same units on each side! 15/9 = 21/x -> 15/9 = x/21 -> x=35.

shortest, longest

(l+2s)(w+2s)

(distance)/(rate) d/r

m-n

1/2

The 75th percentile is less than the average of the 60th and 90th because the tail points in the positive direction.

acute