PSLETommy had 2.4 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of n.
- If n = 14, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= n + n + n + (2n - 8) + (n + 19)
= n + n + n + 2n + n - 8 + 19
= (6 n + 11) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of rope used if n = 14
= 6 n + 11
= 6(14) + 11
= 84 + 11
= 95 cm
Total length of rope not used
= 240 - 95
= 145 cm
1 cm = 0.01 m
145 cm = 1.45 m
Answer(s): (a) (6n + 11) cm; (b) 1.45 m