11) (a) 2 (b) = 4a + 2 2 c (c) 86 = 4a + 2 4a 84 = 21 2 = a 12) S = D / T S = 0.5 / 2 = 0.25 miles per minute 0.25 x 60 = 15 mph Yes, the van was travelling at a safe speed. 3 13) 25 7x + 4 = 21 = 7x = 3 2 x 14) = 27.8° 3 x 15) S = D / T S = 28 / 40 = 0.7 per minute 0.7 x 60 = 42 mph 3 16) c2 = a2 + b2 c2 = 1.52 + 52 c2 = 2.25 + 25 c2 = 27.25 c = √27.25 c = 5.22cm 1 earing = 5.22 + 5.22 + 3 =13.44 Pair of earings = 13.44 x 2 = 26.88cm 4 17) (a) Copy and complete the table below. 2 (b) = 4s + 2 2 g (c) 66 = 4s + 2 64 = 4s = 16 2 s 18) 5m 3 = 37 + m – 4m 3 = 37 – 4m = 40 = 10 3 m 19) 3
11) (a) (b) c = 4a + 2 (c) 86 = 4a + 2 4a = 84 a = 21 2 2 2 12) S = D / T S = 0.5 / 2 = 0.25 miles per minute 0.25 x 60 = 15 mph Yes, the van was travelling at a safe speed. 3 13) 25 = 7x + 4 21 = 7x x = 3 2 14) x = 27.8° 3 15) S = D / T S = 28 / 40 = 0.7 per minute 0.7 x 60 = 42 mph 3 16) c2 = a2 + b2 c2 = 1.52 + 52 c2 = 2.25 + 25 c2 = 27.25 c = √27.25 c = 5.22cm 1 earing = 5.22 + 5.22 + 3 =13.44 Pair of earings = 13.44 x 2 = 26.88cm 4 17) (a) Copy and complete the table below. (b) g = 4s + 2 (c) 66 = 4s + 2 64 = 4s s = 16 2 2 2 18) 5m – 3 = 37 + m 4m – 3 = 37 4m = 40 m = 10 3 19) 3
n4-av-revision-booklet-answers.docx