Question: MOBILE-PHONE AD SPENDING Mobile-phone ad spending between 2005 (t = 1) and 2011 (t = 7) is projected to be
S(t) = 0.86t0.96 (1 ≤ t ≤ 7)
Where S(t) is measured in billions of dollars and t is measured in years. What is the projected average spending per year on mobile-phone spending between 2005 and 2011?