What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

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?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Count the number of lines in the image below ?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Identify the 10 differences between the two given pictures.