5th box -Flashcards

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.

The sum of any two sides is greater than the third side.

The last two digits are divisible by 4.

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