Answer:
14.15
Step-by-step explanation:
tan(DBA)=9/12
so angle DBA is tan^-1 (9/12) = 64 degrees
so that means that angle DBC is 90-64= 26 degrees
then we can do tan(26)=x/12
then plug in and we get around 1.17=x/12
so just miltply by 12 and get 14.15
