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------------------------------------------------ Find the 81st term of the arithmetic sequence -10, -25, -40, ...

To find the 81st term of an arithmetic sequence, use the formula an = a1 + (n - 1)d, where an is the nth term, a1 is the first term, n is the term number, and d is the common difference. In this case, the 81st term is -1210.

Explanation:

To find the 81st term of an arithmetic sequence, we can use the formula:

an = a1 + (n - 1)d

Where an is the nth term, a1 is the first term, n is the term number, and d is the common difference.

In this case, the first term, a1, is -10 and the common difference, d, is -15. Plugging in these values, we have:

a81 = -10 + (81 - 1)(-15)

Simplifying this equation gives:

a81 = -10 + 80(-15)

a81 = -10 + (-1200)

a81 = -1210

Therefore, the 81st term of the arithmetic sequence is -1210.

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