Which formula can be used to find the nth term of
the sequence 3, 21, 147, ... ?
o a1 = 7; an = 2n-1.3
O Q1 = 1 an = an–1:7
O aq = 3; an - 27–707
O 24 = 3; an = an–121

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.