(b) Shown 1 C1 for at least one correct step and no incorrect ones or (c) 0.246(09375) 3 M1 or M1 for A1 for 0.246(09375) or oe (a) 3 M1 for 3) =4 13 x(y – M1 for = 4 + 3x xy A1 cao (b) 3 M1 correct expression for fg(a) – M1 correct equation where fraction has been removed A1 cao 14 2.4 g/cm3 5 B1 for appropriate intervals for measurements P1 for correct process to find upper bound P1 for correct process to find lower bound P1 explanation of correct process to find appropriate degree of accuracy A1 cao 15 6 B1 for expression for Carma’s share B1 for expression for share Banu’s
(b) or Shown 1 C1 for at least one correct step and no incorrect ones (c) 0.246(09375) or 3 M1 M1 for A1 for 0.246(09375) or oe 13 (a) 3 M1 for x(y – 3) =4 M1 for xy = 4 + 3x A1 cao (b) – 3 M1 correct expression for fg(a) M1 correct equation where fraction has been removed A1 cao 14 2.4 g/cm3 5 B1 for appropriate intervals for measurements P1 for correct process to find upper bound P1 for correct process to find lower bound P1 explanation of correct process to find appropriate degree of accuracy A1 cao 15 6 B1 for expression for Carma’s share B1 for expression for Banu’s share