what is the fourth number in the triomino?

http://lms.k12.com/lms/content/progress/course/progress.xhtml;jsessionid=34D1FCE2E8A6FB9DC748996DF17A739C.node5?studentId=28402118433&selectedTab=COMPLETED&courseId=500408&subcourseId=&cid=progress

Question

what is the fourth number in the triomino? 

http://lms.k12.com/lms/content/progress/course/progress.xhtml;jsessionid=34D1FCE2E8A6FB9DC748996DF17A739C.node5?studentId=28402118433&selectedTab=COMPLETED&courseId=500408&subcourseId=&cid=progress

confusionist · Answer

It wants a login. Can you screenshot it?

anonymous · Answer

im not sure how to screenshot it

confusionist · Answer

Your computer might have a tool for it, but if you're on Chrome you can download Lightshot Screenshot. Or you can just tell us what the question is lol

anonymous · Answer

ok its           
                5   -3   8   and you have to find the fourth tiormino  
   
a.0
b.6
c.10
d.16