Step-by-step explanation:
For the equation
, factoring gives us the following:

For the equation
, factoring gives us the following:

From this, we see that the common factor is 
Answer:
300 Backpacks each week]
Step-by-step explanation:
dont have an explanation srry but the answer is totally 300 backpacks a week
15 (3y - 5) = 45y - 75
Hope it helped!