Guided Practice A recursive formula for an arithmetic sequence is given. What is the explicit formula for this sequence?

a1=42an=an−1−6a subscript 1 baseline equals 42 line break a subscript n baseline equals a subscript n minus 1 baseline minus 6

A.
an=42+(n−1)(−6)a subscript n baseline equals 42 plus left parenthesis n minus 1 right parenthesis left parenthesis negative 6 right parenthesis

B.
an=42+(n−1)−(−6)a subscript n baseline equals 42 plus left parenthesis n minus 1 right parenthesis minus left parenthesis negative 6 right parenthesis

C.
an=−6+(n−1)42a subscript n baseline equals negative 6 plus left parenthesis n minus 1 right parenthesis 42