If we wanted to find the 50 th term of the sequence, we would use n = 50. They are a part of the formula, again like x’s and y’s in algebraic expressions. Notice that a n the and n terms did not take on numeric values. So the explicit (or closed) formula for the arithmetic sequence is. Now we have to simplify this expression to obtain our final answer. This is enough information to write the explicit formula. The first term in the sequence is 20 and the common difference is 4.
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