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 (A) . Based on the sample she picked, Rachel’s generalization is (B)

A

Biased, not biased

B

Valid, Not valid

Consider the function f left parenthesis x right parenthesis equals 4 x squared minus 3 x minus 1f(x)=4x2−3x−1 and complete parts (a) through (c). (a) find f left parenthesis a plus h right parenthesis f(a+h); (b) find startfraction f left parenthesis a plus h right parenthesis minus f left parenthesis a right parenthesis over h endfraction f(a+h)−f(a) h; (c) find the instantaneous rate of change of f when aequals=77.