OMG PLS HELP IM GONNA FAIL1

Me with this one question, and i'll upvote the brainliest answer

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?