Question

..1+4=5. 2+5=12. 3+6=21. 8+11=40 or this could be 96 which is right and why

Answer 1

Multiply the numbers being added then add the first number. 4X1=4, 4+1=5.
2X5=10, 10+2=12. 11X8=88, 88+8=96. I'm not sure how to get 40, though. 
Hope I could help.