yes
It means something that doesn't change, like a number.
The change in y over the change in x
No
Invariably means constant and not prone to change, and can mean always.
Constant just means that the number does not change. For example, in Chemistry, avogadro's number is 6.022x10^23 and that number will never change, therefore it is a constant.
Nothing stays the same for ever.
if a number can change randomly it is called a variable
the object's speed doesn't change
The variable will change at a constant rate. Its pattern will never be broken or changed throughout its process.
A constant in an algebraic expression is a number that does not change. For example x + 2 The 2 is a constant (does not change) x is a variable (can take on any value)
It is called a constant and it value remains the same.
It is travelling at a constant speed. This does not mean that there is no acceleration or that the direction of motion remains the same.