Help with this please its pretty easy

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) =

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Find the value of the variable and the length of each chord for #5 and #6.