Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Can you count the number of quadrilaterals in the picture below?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Which tank will fill first?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Count the number of squares in the picture below.