Hey there! :)
Answer:
$96 spent.
Step-by-step explanation:
Set up a proportion to determine the amount spend for 72 sheets. Express it in sheets/amount spent:

Cross multiply:
6 · x = 8 · 72
6x = 576
Divide:
x = $96 spent for 72 sheets.
A) Possible outcomes are ...
(1, 3), (1, 4), (2, 2), (2, 3), (3, 1), (3, 2), (4, 1)
for a total of 7 out of 36 outcomes that match your requirements.
p(3 < sum ≤ 5) = 7/36
B) Possible outcomes are ...
(6, 1), (6, 3), (6, 5), (1, 6), (3, 6), (5, 6)
for a total of 6 out of 36 outcomes that match your requirements.
p(6 and odd) = 6/36 = 1/6
7c^2d^2-14cd
Hope this helps a bunch!!!!!!!!!!!!