7) Given S, = (4-1)' +2, which is the sum of the first in terms of a series, find first four Partial Sums (same as 1A). For the following, define them using the terms of a general sequence. What does S, mean What does S, mean? What does S, mean? Use the sums to find the first four terms of the series, Grap the sum equation. Label the terms on the graph (like #1 & 2)