to estimate the percent of red marbles in a large bag of marbles, margo will use the following sampling method. she will randomly select a marble, record its color, put it back into the bag, shake the bag to thoroughly mix the marbles, and then repeat those steps. she will perform the procedure many times. what type of sampling method is margo using?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?