Which expression is a cube root of -2
A. 3sqrt2 (cos(260degrees) +isin(260degrees))
B. 3sqrt2 (cos(60degrees) +isin(60degrees))
C. 3sqrt2 (cos(120degrees) +isin(120degrees))
D. 3sqrt2 (cos(90degrees) +isin(90degrees))
thanks!

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