What do your models show about removing sets of positive counters? removing sets of negative counters?

When you remove a set positive counter the number decrease

When you remove a set of negative counter the number increases

Step-by-step explanation:

When you remove a set positive counter the number decrease it's like subtracting like adding a negative counter (-)

Example: 10 - 5 = 5

When you remove a set of negative counter the number increases it's like adding a positive counter (+)

Example: -10 - (-5) = -5

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer