Question

How to define variable and constants in mathematica?

Answer 1

➰variable are the alphabet that we use ➰the constant are numbers been used in an equation.
➰ variables are the unknown value in equation

for example
➰18x
18-constant
x-variable

Answer 2

variables are the unknown values which can change for example the minimum and maximum temperature of tomorrow's day
constant is nothing but known value which cannot change for example number of months in an year