PSLEAndy had 2.8 m of streamer. He used some of it to make the figure as shown.
- How much of the streamer did Andy use to make the figure? Leave your answer in the simplest form in terms of n.
- If n = 20, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= n + n + n + (2n - 8) + (n + 13)
= n + n + n + 2n + n - 8 + 13
= (6 n + 5) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of streamer used if n = 20
= 6 n + 5
= 6(20) + 5
= 120 + 5
= 125 cm
Total length of streamer not used
= 280 - 125
= 155 cm
1 cm = 0.01 m
155 cm = 1.55 m
Answer(s): (a) (6n + 5) cm; (b) 1.55 m