Since Youfube first became avaliable to the public in mid-2005, the rate at which video has been vplosded to the site can be approximated by v(t)=1.1t22.6t+2.3millionhoursofvideoperyear(0t9), where t is time in years since the start of June 2005 . (a) Find an expression for the total number of hours V(t) of video at time t (starting from zero hours of video at t - 0 ). (Round vour coefficients to four decimal places.) 2(t)= (b) Use the answer to part (a) to estimate the total number of hours of video uploaded by the start of 2007. (Round your answer to the nearest million hours of video.) x million hoors of video The marginal revenue of the xth box of flash cards sold is 500e0.052 dolurs per box. Find the revenue generated by selling items 101 through 4,000 . (ikcund your aniviver to the nearest cent.)