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

What is the Surname of Barbie Doll?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What do you see in the image below

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Through your logical capabilities, can you make 7 an even?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What is the next number in this series?

4,12,84,3612....