torirobinson040217 torirobinson040217 01-10-2022 Mathematics Answered 1. Find the first three terms of the arithmetic series. Remember to use the formula S, - (a₁ + a) to find n, and the formula a, = a₁ + (n-1)d to find d. a₁-10, a, -26, S, - 80 26 +22+18+... O-10+16+42+... O-10+-14+-18+.... O-10+-6+-2+...