A large multiplex movie house has many theaters. The largest theater has 50 rows. There are 13 seats in the first row. Each row has two seats more than the previous row. How many total seats are there in this theater?
There are seats in the theater.

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