please help me with this textbook problem

Question-1. Sam invests $30 in stock A and $70 in stock B. Let RA and RB denote the daily price change of stock A and B, respectively. For example, -0.03 means a decrease of 3%. RA and RB are distributed according to the following table, where each entry is equal P(RA = a, RB = b). a -0.03 0.00 +0.03 b -0.04 0.03 0.30 0.05 +0.04 0.03 0.35 0.24 (Make sure your answer includes a copy of this table) (a). Are RA and RB independent? Justify your answer. (b). Calculate E[RA], VIRA] and Cov( RA, RB). (c). The total return in dollar amount of Sam's stocks is given by W = 30 x RA + 70 X RB. Calculate E[W] and V[W]. Show detailed work in all parts. Round numerical answers to three decimal places