given the sequence: -23, -18, -13,-8, ...
A) the common difference = -18 - (-23) = 5
B) Write an equation to represent the sequence.
The equation is = (-23) + 5 ( n - 1)
C) Find the 13th term
a13 = (-23) + 5 ( 13 - 1 ) = -23 + 5 * 12 = 37
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