1 £101

2 (a) X (b) X ( zero grad : not yet jumped ; steep downhill gradient: free-fall ; change to less steep gradient: parachute opens )

3 (a) x = 0.75 m (b) 7.2 m³

4 (a) 9 x 17 = 153 (b) n (2n -1)

5 y = 2x +1

6 5 cm

7 (a) 2.48m (b) 26.7m

8 4.7m

9 (a) £68 (b) C = 4p + 6d - 12

10 410m

11 (a) a = 1.5 b = -2.5 (b) k = d t + m (c) x = 0 or 7

12 16.6m

13 (a) T = k x S / E (b) 18 minutes

14 (a) (20 x 8) - (22 x 6) (b) proof

15 x = 73.4 , 286.6

16 v = 13 m/s

17 (a) (2a +3b )(2a - 3b ) (b) 1 / 6x

18 (a) 19.2m (b) 19m

19 (a) 23 - 2 (b) b

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