Does (-2)^n/( 3^n+1) converge or diverge?

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

Math it's appreciated. (picture provided)

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 . reset next