a department store has determined that 45% of all its sales are credit sales. a random sample of 85 sales is selected. what is the probability that the sample proportion will be greater than 0.54

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0