Mr. Santos plants beans and squash in the areas shown in the model below. A model with 3 rows of 4, representing 12 acres of beans, and 3 rows of 7, representing 21 acres of squash. Which expression is equivalent to the sum of the two areas? 3 (4 + 7) acres 7 (3 + 4) acres 4 (3 + 7) acres 3 (3 + 7) acres