The answer should be -7°. What I did was just subtract 7 for each day. Im pretty sure there is a faster way, but this is how I did it
Answer:
Counting by 2's 6
Counting by 5,2 but the you'd have to round
9/10 of an ounce is 0.9. 0.9 X 72 = 64.8.
There is 64.8 ounces in a box.