Answer:

1. 2

2. 84

3. 12

Step-by-step explanation:

1. 9 + 3(5) - 5(4)

9 + 15 - 20

24 - 20

4

2. 2(6(7)+3)-3(2))

2(42+3)-(6)

2(45)-6

90-6

84

3. -3(4) + 2(7(3)-9)

-12 + 2(21-9)

-12 + 2(12)

-12 + 24

12

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