To find the total number of tubes of paint the art teacher bought, we need to multiply the number of packs by the number of tubes in each pack.
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18 + 18 + 18 + 18 = 72: This equation correctly represents the total number of tubes by adding together the number of tubes in each of the 4 packs.
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04 × 18 = 72: This equation also correctly represents the total number of tubes as it calculates the total using multiplication (though it looks like there is a typo with "04" which should be "4").
The equations that represent the total number of tubes of paint the teacher bought are:
- 18 + 18 + 18 + 18 = 72
- 4 × 18 = 72
The following equations are incorrect:
- 18 + 4 = 22 (does not represent the total tubes)
- 22 - 4 = 18 (also does not represent the total tubes)
The two correct equations are the first and fourth options, assuming the fourth is intended to be "4 × 18 = 72".