Answer:
amt. the shop spends on 40 pairs
= $11 × 40
= $440
amt. paid extra (due to fixed cost) per pair
= ($450 - $440) ÷ 40
= $0.25
amt. per pair to break even
= $11 + $0.25
= $11.25
Answer:(3x+7)(x+2)
Step-by-step explanation:
Check the attached file for the solution.
Answer:

Step-by-step explanation: