Question

How do you write this as a variable expression "the sum of -3 and a number?

Answer 1

`x-3`

Explanation:

In a variable expression, "a number" is represented by a variable, (letter). I this case I chose to use `x` as "a number". So the sum of a number `(x)` and `(-3)` can be written as:
`x+(-3)` which simplifies to:
`x-3`