Respuesta :

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Answer:

C  8ab +5b

Step-by-step explanation:

1 /3 (6ab - 9b) + 2/3 (9ab + 12b)

Distribute the fractions

1 /3 (6ab) - 1/3(9b) + 2/3 (9ab) + 2/3(12b)

2ab - 3b +6ab +8b

Combine like terms

2ab +6ab -3b+8b

8ab +5b

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Answer:

78ab+234b

Step-by-step explanation:

13 (6ab - 9b) + 23 (9ab + 12b)

open the bracket

78ab-117b+207b+144b

combine the like terms

78ab+234b