Question 1068805
The common ratio can be calculated as
{{{22/(-11)=-2}}} .
Each term is the one before times {{{(-2)}}} ,
so after {{{22}}} comes {{{22*(-2)=highlight(44)}}} ,
and if {{{x}}}= that mystery first term, then
{{{(-2)x=-11}}} --> {{{x=(-11)/(-2)=highlight(11/2=5.5=5&1/2)}}} .