In a sequence of 19 numbers, after the first term, each term is 9 more than the previous term. If the last term in the sequence is 200, what is the first term?

Correct.
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In the given sequence, $$d = 9$$ and $$A_{19} = 200$$. Plug in $$d=9$$, $$n=19$$, and $$A_n = 200$$ into the formula and solve for $$A_1$$:
>$$A_n = A_1 + (n - 1)d$$
>$$200 = A_1 + (19 - 1) \times 9$$
>$$200 = A_1 + 18 \times 9$$
>$$200 = A_1 + 162$$
>$$38 = A_1$$

Incorrect.
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Incorrect.
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Incorrect.
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Incorrect.
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9

10

20

29

38