To find the total number of tubes of paint the art teacher bought, you can use multiplication since there are 4 packs with 18 tubes each. The correct equations that represent this scenario would be:
- \(4 \times 18 = 72\)
- \(18 + 18 + 18 + 18 = 72\)
These equations correctly calculate the total number of tubes of paint.
So, the TWO correct responses from your options are:
- \(18 + 18 + 18 + 18 = 72\)
- \(4 \times 18 = 72\)