-2.5 because a positives opposite is a negative.
Answer:

Step-by-step explanation:

Answer:
9.07 and 7.77 respectively.
Step-by-step explanation:
To determine the upper control limit, add 0.65 lb to 8.42 lb, obtaining 9.07 lb.
To determine the lower one, subtract 0.65 lb from 8.42 lb, obtaining 7.77 lb.
Answer:
<em><u>$432</u></em>
Step-by-step explanation:
Students:24
Ticket:$9
Lunchbox:$9
9+9=18
24x18=$432