Identify the hidden meaning behind this picture?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

What occurs twice in a week, once in a year but never in a day?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

10+10 and 11+11 can give you the same answer.

Explain how?