Business Email The average number of email messages sent and received per corporate user per day in year t between 2011 (t = 1) and 2015 (t = 5) is projected to be f(t) = 3t + 69 (1 ≤ t ≤ 5). The average number of spam emails sent per corporate user per day for the period under consideration is projected to be g(t) = −0.2t + 13.5 (1 ≤ t ≤ 5). (a) Find a function, h, giving the projected average number of legitimate (non spam) emails sent and received per corporate user per day in year t. Hint: h(t) = f(t) − g(t).