A man starts a chain letter by writing to five friends. Each friend in turn writes to five others. If this is continued for six rounds, how many people will have received the chain letter

Consider this expression and the steps to evaluate it. 4^5(−2)^9/4^8(−2)^3 1. apply the quotient of powers:      (−2)^a/4^b 2. evaluate powers:           c/d select the value of each variable. a = _ b = _ c = _ d = _