Is f(x)=2xy linear of nonlinear

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

Determine the fraction of total interest owed. after the fourth month of a 12-month loan: the numerator is: {(n + ) + (n + ) + (n + ) + (n + )} = , and the denominator is: {(n) + (n + 1) + + (n + )} = . therefore, the fraction is numerator/denominator (to the nearest tenth) =

Me. i can't figure out this question. give an explanation too. .