Plz help and thank you

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 three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

What is the factored form of the following expressions? d^2 – 13d + 36