M1 for adding shares A1 cao (a) 320 2 M1 for sight of 1:4 or 4:1 16 A1 cao (b) 1 373 600 3 M1 for sight of 1:8 of 8:1 M1 for 8 171700 A1 cao 17 (a) +2b + 8a (= 4a + 2b) 2a + b 2 M1 A1 correct method to find in terms of a and b −4a (b) 4a + 2a (= 6a + and 2 M1 Correct vectors for and or for + b b) 2b + 8a + 4a (=12a + 2b) and or for and (need not be simplified) ft their from (a) or 4a + 2a + b (= 6a + b) and b + 2a + 4a (= 6a + b) or 2b + 8a + 4a (= 12a + 2b) and
M1 for adding shares A1 cao 16 (a) 320 2 M1 for sight of 1:4 or 4:1 A1 cao (b) 1 373 600 3 M1 for sight of 1:8 of 8:1 M1 for 8 171700 A1 cao 17 (a) −4a +2b + 8a (= 4a + 2b) 2a + b 2 M1 A1 correct method to find in terms of a and b (b) 4a + 2a + b (= 6a + b) and 2b + 8a + 4a (=12a + 2b) or 4a + 2a + b (= 6a + b) and b + 2a + 4a (= 6a + b) or 2b + 8a + 4a (= 12a + 2b) and 2 M1 Correct vectors for and or for and or for and (need not be simplified) ft their from (a)
12_practice_tests_set_7_-_paper_3h_mark_scheme_final.docx