Question 167753
the sum of the terms for an arithmetic sequence is the number of terms (n) multiplied by the average value of the terms
__ (T1+Tn)/2


S = n(5+5+3(n-1))/2 = n(10+3n-3)/2 = (3n^2+7n)/2


(3n^2+7n)/2 = 25n __ 3n^2+7n=50n __ 3n^2-43n=0 __ n(3n-43)=0


n=0 __ they are together on July 1


3n-43=0 __ 3n=43 __ n=14 1/3 __ John passed Miku on July 15