Precalculus
Determine the thirteenth term of the sequence 2, -7, -16,... using the equation of the arithmetic sequence, an = 2 + (n - 1)(-9).
Identify the first four terms and the last term. Also, evaluate the sum using the formula Sn = (n/2)(a1 + an).
For the arithmetic sequence with a1 = 48 and d = - 2, find a80.
Enumerate the first five terms of the arithmetic sequence given the following values.
an = an - 1 + 4, a1 = - 12