Question

Question #fd77b

Answer 1

"Twice the difference of a number and 7" is written like this:

`color(white)(mmmmmm)` `2` `(n - 7)`

Explanation:

These word descriptions of quantities can be confusing because it's hard to figure out how to write the words as numbers

The trick is to find a way to express this amount by going step-by-step.

Let `n` = "the number"

• The number . . . . . . . . . . . . `n` `larr` the number
• Subtract 7 . . . . . . . . . . . . . .`n - 7` `larr` the difference between `n` and `7`
• Double that amount . . . `2` `(n - 7)` `larr` twice the difference