Mathematics · Oct / Nov 2021 · Paper 41 · Question 9

3.5 oe [3]

M1 for 2(x + x + 3) = 20 oe

M1 for correct ax = b for their linear equation

116.8 or 116.83 to 116.85 nfww [5]

M2 for 5sin 20 sin p = 2.5

or M1 for 2.5 5 = sin 20 sin p

A1 for 43.2 or 43.15 to 43.17 M1dep for 180 – (20 + their 43.2) After 0 scored,

SC1 for length of side = 5

5.07 or 5.068 to 5.071 [6]

B3 for 7.41 or 7.412 to 7.413

or M2 for r + r + 40 × × π× = 20 oe 2 r 360

or M1 for 40 × × π× oe seen 2 r 360

M2 for 2 × 7.41 × sin 20 oe or 7.412 + 7.412 – 2(7.412) cos 40 oe or 7.41sin 40 oe sin70

or M1 for implicit version