joshmc9888 joshmc9888 30-05-2023 Mathematics contestada For each of the summations given below, use the formula for the sum of the first n integers either to evaluate the sum or to express it in closed form. (a) 6 + 7 + 8 + 9 + ... + 600 (b) 6 + 7 + 8 + 9 + ... + k