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Grade 9·11 problems·~13 min·Common Core Math - HS Functions·group·hsf-bf-a-2

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Procedures

A sequence is defined recursively as $a_1 = 7$ , $a_n = a_{n-1} + 4$ .
Which explicit formula is equivalent?

$a_n = 7 + 4n$

$a_n = 4 + 7(n-1)$

$a_n = 7 + 4(n-1)$

$a_n = 7 \cdot 4^{n-1}$