The 15th term of the arithmetic sequence 
Option B is correct
The nth term of an arithmetic sequence is given as:

The first value, a = 22

Since 

The common difference, d = 3

The 15th term of the arithmetic sequence = 64
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The answer is C. Once you add the like terms x^2 and 4x^2 you get your answer.
The answer is 20000000000 1 plus 1 is two and 2 times 10000000000 is 20000000000