A gardener plants roses and carnations in the areas shown in the model below. A model with 4 rows of 4 squares, representing 16 acres of roses, and 4 rows of 3 squares, representing 12 acres of carnations.

What value correctly fills in the blank in the equation 16 + 12 = 4 x (blank + 3) to show the sum of the two areas of flowers?
2
3
4
8

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is