Determine whether the lines through each pair of points are perpendicular. (-2,- 4) and (-10,- 14); (-15,3) and (-10,- 1)

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