Question

How do you translate "twice a number x" into a mathematical expression?

Answer 1

`2x`

Explanation:

"Twice' simply means "multiply by 2".

In algebra we usually do not know the values of the numbers we are working with, we just call them variables and use letters to represent them.

IN this case the number we are talking about is `x`.

In the same way as twice 3 is written as `2xx3`,

T
"Twice `x` is `2xx x`, but leave out the `xx` sign and simply write it as `2x`