7.2 Phone Inventory A store tracks the number of cell phones it has in stock 1) What do you think it means when the change is and how many phones it sells. The table shows the positive? Negative? inventory for one phone model at the beginning of each day last week. The inventory changes when they sell positive phones or get shipments of phones into the store. negative... inventory change ✓ Monday 18 -2 2) What do you think it means when the inventory is positive? Negative? Tuesday 16 -5 positive Wednesday 11 -7 negative Thursday 4. -6 ✓ Friday -2 20