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

I have feet, but no legs. Which animal Am I?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

How many times in a given day, minutes and hour clock comes in a straight line ?

What jumps when it walks and sits when it stands?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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?

Optical Illusion: A cat is hiding in plain sight in the backyard. Only the most observant eyes can spot the cat in 7 seconds. Can you? Test your eye power now!

I have branches, but no fruit, trunk or leaves. What am I?