Answer: x + 10
Explanation:
The 10th term of the arithmetic sequence will be:
= a + 9d
where a = 3x + 4
d = x + 10 - (3x + 4)
= x + 10 - 3x - 4
= -2x + 6
Therefore, a + 9d = 3x + 4 + (-2x + 6)
= 3x + 4 - 2x + 6
= 3x - 2x + 4 + 6
= x + 10
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