<span><span>PART A) the initial value of the function is 150 at 0 weeks, that means that there are still 150 songs to be downloaded at the beginning. </span> The rate of change is -30 songs each week, that is because the amount of songs left to be downloaded decrease by 30 each week.</span>
<span><span>PART B: </span><span> lets use 2 points of the graph p1(0, 150), p2(1, 120) calculate the slope: m = (y2- y1)/(x2 - x1) = (120 - 150)/(1 - 0) m = -30 and now use line equation in form point-slope: y - y1 = m(x - x1) y - 150 = -30(x - 0) y = -30x + 150</span></span>
