Rick found the are of this shape is 15 square unit. If he used a smaller unit square, would his measurement be greater than 15 squares units or less than 15 square units?

If he used a smaller measurement, the measurements would still be equal to that square units.

Example 15 cm^2, if he used smaller unit like mm^2, it's 150 mm.

15 cm^2 = 150 mm^2

If you mean that the number itself, then 150>15

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times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.