Igot it wrong and i am doing test corrections. does anyone know the answer? if you do reply asap

Determine the fraction of total interest owed. after the seventh month of a 12-month loan, the numerator is: {(n + 11) + (n + 10) + (n + 9) + (n + 8) + (n + 7) + (n + 6) + (n + 5)} = , and the denominator is: {(n) + (n + 1) + + (n + 11)} = . therefore, the fraction is numerator/denominator (to the nearest tenth) = %.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Which of the following can be used to explain a statement in a geometric proof?