Help this a grade! I'm having difficult time understanding this

George writes the mixed number as sum and uses the distributive property 1/2.-2/5=1/2-2+2/5=1/2

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio

Which of the following is not a correct form of the quadratic function?