Find an explicit formula for the geometric sequence −8,−40,−200,−1000 c(n)= Please Answer Fast

This is different from the first one can someone me

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.

Type the correct answer in the box. use numerals instead of words. if necessary use / for the fraction bar.