a relationship between numbers where each number in the domain corresponds to exactly one number in the range
a function whose domain is the set of all positive integers
formula for a sequence
t sub n = t₁ + (n-1)d
explicit formula for an arithmetic sequence
state a term; t sub n = t sub (n-1) +d
recursive formula for an arithmetic sequence
t sub n = t₁ * rⁿ⁻¹
explicit formula for a geometric sequence
state a term; t sub n = t sub (n-1) * r
recursive formula for a geometric sequence
S sub n = n [(t₁ + t sub n)/2]
formula for the sum of the first n terms in an arithmetic sequence
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