Makes an attempt to subsitute 7 into the equation, for example, seen. M1 1644 or 1640 only (do not accept non-integeric final answer). A1 (2 marks) It is the initial bacteria population. B1 (1 mark) States that or that M1 Solves to find M1 24 (hours) cao (do not accept e.g. 24.0). A1 Using their value for from above, makes a substitution into the vectors to form a + b M1ft p 10i 5j + 6i 15j – – Correctly simplifies. 16i 20j A1ft – NOTES: OR M1ft: substitute their = 4 into their a + b = A1ft: correct m mc. (2 marks) simplification. Total: 6 marks
Using their value for p from above, makes a substitution into the vectors to form a + b 10i – 5j + 6i – 15j M1ft Correctly simplifies. 16i – 20j A1ft NOTES: OR M1ft: substitute their m = 4 into their a + b = mc. A1ft: correct simplification. (2 marks) Total: 6 marks Makes an attempt to subsitute 7 into the equation, for example, seen. M1 1644 or 1640 only (do not accept non-integeric final answer). A1 (2 marks) It is the initial bacteria population. B1 (1 mark) States that or that M1 Solves to find M1 24 (hours) cao (do not accept e.g. 24.0). A1
19725_02_as_pure_mathematics_practice_paper_a_mark_scheme.docx