Let's start with 9:
An number outside of parentheses means to multiply the two together. When you multiply two negative numbers together the answer becomes positive. This means -3 * -4 = positive 12. Number 9 is D. 12
For number 10:
Subtracting a negative number is the same as adding a positive number. I look to answer C. which reads:
-7 -(-4) This is the same thing as -7 + 4 which equals -3.
Number 10 is C. -7 -(-4)
Number 11:
Adding a negative number is the same thing as subtraction. This means we can rewrite -6 + (-9) to:
-6 - 9, which equals -15
Number 11 is A. -15
