There are nine boxes in each pack. Garth bought 2 packs, all together containing 18 boxes. So 18÷2=9. Rico bought 4 packs, so 36 boxes divided by 4 equals 9. And so on. Your answer is 9 boxes = 1 pack.
(D)We can prove THEOREMS with geometric rules........
I think this is the answer
Cos60° = 0.5
Any angle less than 90° is an acute angle.
Therefore, 60° is the acute angle.
Answer: Susan, sam forgot to flip the signs while dividing a negative number.