PSLECole had 2.3 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 = 19, 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 + 17)
= n + n + n + 2n + n - 8 + 17
= (6 n + 9) cm
(b)
1 m = 100 cm
2.3 m = 230 cm
Total length of rope used if n = 19
= 6 n + 9
= 6(19) + 9
= 114 + 9
= 123 cm
Total length of rope not used
= 230 - 123
= 107 cm
1 cm = 0.01 m
107 cm = 1.07 m
Answer(s): (a) (6n + 9) cm; (b) 1.07 m