Olivia writes an expression that is the sum of three terms. The first term is the product of 2 and the sum of 4 and n.

The second term is 3 squared times n.

The third term is the product of 4 and 2 less than n.

The expression is equal to 30.

What is n?

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