145 3. Write an equation for the no term of the following sequences. an = a1 + (n-1)d a. -30, -21, -12, -3, 6 ... b. 305, 243, 181, 119, 57 4. Use the formula for arithmetic sequences to solve the following problems. an = a1 + (n-1)d a. If azg = 341 and the common b. If a83 = -101.5 and the common difference is 15, find the first difference is 7.25, find the first term term in the series. in the series. an = n = d = an n = d =