Anybody plz Help with this quickly

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) =

Just tell me how to set up the equation.

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12