Respuesta :

Mala388

Answer:

Step-by-step explanation:

10b + -2

or

10b - 2

8b + 2b = 10b

7 - 9 (or 9 - 7, which equals 2) = -2

you can add -2 which is

10b + -2

or subtract

10b - 2

CloverDwarf

Answer:

10b-2

Step-by-step explanation:

8b+2b is 10b. Then 7+(-9) is -2. Combine the answer to get 10b-2

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