Write the sum using summation notation, assuming the suggested pattern continues. 9 - 18 + 36 - 72 + ... (2 points) summation of nine times two to the power of n from n equals zero to infinity summation of nine times negative two to the power of the quantity n plus one from n equals zero to infinity summation of nine times two to the power of the quantity n plus one from n equals zero to infinity summation of nine times negative two to the power of n from n equals zero to infinity