Please help, multiple choice

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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 . reset next

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.