Susan used 0.90 gallons of paint to paint one wall in a room. how much paint will susan need to paint 8 more walls of the same size? gallons

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