Fully simplify.
(3x+y)^2

On a piece of paper graph f(x)=5•(0.4)^x

How do i do this activity, is appreciated

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) =