Aproton moves in an electric field such that its acceleration a is a=-20(1+2t)^-2, where t is the time in seconds. find the velocity as a function of time if v sub zero =30 when t=0

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock