Determine the thirteenth term of the sequence 2, -7, -16,... using the equation of the arithmetic sequence, a_n = 2 + (n - 1)(-9).

Consider the integers between 63 and 95. What is the sum of the even integers between these numbers?

For the given arithmetic sequence, evaluate the sum of its first 30 terms. - 9, - 6, - 3, 0, 3, ...

A certain arithmetic sequence has a common difference, d = -7 and the first term is a₁ = 5. Find a₁₇.