Double question help plz solve with more points

Can someone show me step by step how to do this?

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

Is (root2 -2)^2 rational or irrational. show the steps and answer fast