twice the difference of a number and 9 is at least -18

Answer 1

Let's let x represent the unknown number. The word, "twice", is two times a number and the word, "difference" indicates subtraction.

We can write the following expression to represent "twice the difference of a number and 9" as: 2x - 9

To represent "at least -18" , we can write: > -18

When we combine these, the final inequality will be: 2x - 9 > -18