PSLEJeremy had 3.8 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 = 30, 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 + (3n - 3) + (n + 14)
= n + n + n + 3n + n - 3 + 14
= (7 n + 11) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of streamer used if n = 30
= 7 n + 11
= 7(30) + 11
= 210 + 11
= 221 cm
Total length of streamer not used
= 380 - 221
= 159 cm
1 cm = 0.01 m
159 cm = 1.59 m
Answer(s): (a) (7n + 11) cm; (b) 1.59 m