Consider the sequence $7,12,17,22,27,32$dots$2,5,9,$ you would enter the comma separated list $3,4$ since $5-2=3$ and $9-5=47,12,17,22,27,32$dots$2,5,9,$

you would enter the comma separated list $\frac{5}{2},\frac{9}{5}7,12,17,22,27,32$dots Use $nas$ your index and start with $n=0,$ that $is,b_0=7.$

$b_n=$

Find a closed formula for the sequence $-7,12,-17,22,-27,32$dots Use $nas$ your index and start with $n=0,$ that $is,c_0=-7.$

$c_n=$