What are the ratios in 3 proportions each.

Add 1/7 + -1/7 your answer should be reduced to its smallest form and should not be an improper fraction

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 cosine function that is represented in the graph.