Question

Which expression best represents the difference between triple a number and double a number?

Answer 1

3x-2x

Answer 2

its nothing but the number itself

Answer 3

you start of with a number
this number can be any number so think of it as an unknown

unkown number shall be denoted as x

so you have x

you want triple the number

3x

you also want double the number
2x
you want the difference so you subtract these two terms

3x-2x