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

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 has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Find the next number in the following series:
6, 14, 26, 98, __?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

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