Question

What are constants? Please give me an example...

Answer 1

Constants are things that never change or aren't changed during experiments

Answer 2

BUT in math its A number with no variable

Answer 3

a constant is just a number, or a symbol for a value that does not change.

Variables, on the other hand, can assume any value as needed.

For example, if an item costs 2 dollars, then if you buy n items, you will spend
2n dollars. 2 is a constant. the price will not change. The number of items you buy may change depending on circumstances.

Notation conventions generally use letters early in the alphabet for constants (a-n) and later letters (p-z) for variables. So, if you see an equation like

y = 3kx + 4

it usually means the k is an unknown fixed value (constant), and x is a variable. x is independent, meaning you can choose any value you want, and y is dependent, in the sense that once x is chosen, you can obtain the value for y by multiplying x by 3k and adding 4. We may not know at once just what k's value is, but it will not change, no matter which value we choose for x.