Hello can you please help me? theres a pic thats all the info you need

After two years, how much has been paid into interest?

Use sigma notation to represent the following series for 9 terms.

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