Write the sum using summation notation, assuming the suggested pattern continues. -3 + 6 + 15 + 24 + ... + 132 summation of negative 27 times n from n equals 0 to infinity summation of negative 27 times n from n equals 0 to 15 summation of the quantity negative 3 plus 9 n from n equals 0 to infinity summation of the quantity negative 3 plus 9 n from n equals 0 to 15 please help!