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Edexcel-Igcse-Mathsbook2-Answers

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Edexcel IGCSE Maths 2 Answers to activities and exercises Unit 1 NUMBER 11 ACTIVITY 1 Time (h) Speed (km/h) 1 160 2 80 4 40 6 26.7 7 22.9 8 20 EXERCISE 1 1 a 4 days 2 3 4 5 6 7 8 a a a a a a a 28 days 8 men 12 people 60 years 40 000 men 12 hours 32 km/litre b 2 days b b b b b b b 6 days 16 men 8 people 15 years 20 000 men 72 km/h 20 litres c 2 c c c c c 2 days 3 4.8 days 32 men 6 people 1200 years 400 men EXERCISE 1* 1 a Number of light bulbs (N) 6 5 2 30 b 3000 = NP 2 a Number of years (N) 1 2 4 10 Number of men (M) 100 000 50 000 25 000 10 000 Power of each bulb (P) 500 600 1500 100 IGCSE Maths Answers – Unit 1 1 b 100 000 = NM 3 a 12 g/cm3 4 a 10 minutes 5 Number of men 100 000 100 000 20 000 400 000 IGCSE Maths …show more content…

As x approaches 0, y approaches so at x = 0, y is not defined as denoted by EXERCISE 9 1 2 3 4 5 a t (months) y 1 2000 2 1000 3 667 4 500 5 400 6 333 b c 3.3 months 6 a t (hours) y (m3) 1 1000 d 2.7 months approx. 5 200 10 100 15 67 20 50 IGCSE Maths Answers – Unit 1 9 b c 4 hours 7 a k = 400 m (min) IGCSE Maths Answers – Unit 1 t (°C) b 5 80 d 6 62.5 m3 7 57 8 50 9 44 10 40 67 c 53 (°C) e 5.3 m d 8 6 min 40 s EXERCISE 9* 1 2 3 4 5 a x (°) d (m) 30 3.3 35 7.9 40 10 45 10.6 50 10 55 8.6 60 6.7 b 10.6 m at x = 45° 37° x 54 6 a x R x C 0 0 1 2 1 3 3 4 2 4 5 6 3 4.5 4 4.8 5 5 b P > 0 when 0.27 < x < 3.7 so between 27 and 370 boards per week 10 c £1100 when x = 1.45 so 145 boards hired out 7 b r (m) A (m2) 1 106 2 75 3 90 4 126 5 177 c A = 75 m2 at r = 2.0 m

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