Write a program that specifies whether a given number (x) falls in one of the following categories (give x a value from the code, don't read from user): • 0 to 9 • 10 to 19 • 20 to 29 • None of the categories. For example: if x = 5, program should print "0 to 10", and if x = 44 it should print "None". Hint: use if statements with Boolean expressions combined using &&

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.