Ahomeowner chooses 9 of 25 plants at a nursery to landscape her front yard. which expression gives her the number of ways she can choose the plants?

9c25

9p25

25p9

25c9

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