Can someone answer these in interval notation?

Find the missing dimension! need asap! tiny square is a =3025 in ²

Find the measure for the angle indicated in bold

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