Guided Practice Write a rule for a geometric sequence that has −6negative 6 as its first term and a common ratio of 2. What is the tenth term of this sequence?

A.
an=2 · −610−1; −20,155,392a subscript n baseline equals 2 times negative 6 superscript 10 minus 1 baseline semi-colon negative 20,155,392

B.
an=−6 · 2n; −6,144a subscript n baseline equals negative 6 times 2 superscript n baseline semi-colon negative 6,144

C.
an=−6 · 2n−1; −3,072a subscript n baseline equals negative 6 times 2 superscript n minus 1 baseline semi-colon negative 3,072