Does this equation represent a function? Why or why not?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

If two lines form congruent alternate interior angles with a transversal, then the lines

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