Answer:
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Step-by-step explanation:
Im pretty sure its 18.
yes
|-12| = |12| they always equal to 12
885.45
11a. 15x + 6
11b. x + 8 < 16 or x + 8 - 16
12. 3x + 15 + 5x = 8x + 15
13. 7x + 31