First, replace all variables with the given values.
12(9) + 9(2) + 2(12)
This should then equal 150, then the formula says to multiply this answer by 2. Doing so, should give a final answer of 300.
Answer:
The last one.
Step-by-step explanation:
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➷ The nth term would be x3
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For the first one it is the fourth one 15/x