Given the sequence: 5, 15, 45, 135, ...
a. Express the sequence, an, using an explicit formula.
b. Find the 16th term.
c. Express the sequence, an, using a recursive formula.
a. using an explicit formula, a(n) = 3*(n-1). n is the term number.
b. the 16th term is 216233605
c. 3^n*5, n is the term number
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