PSLELuke had 3.9 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 = 23, 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 - 4) + (n + 19)
= n + n + n + 2n + n - 4 + 19
= (6 n + 15) cm
(b)
1 m = 100 cm
3.9 m = 390 cm
Total length of streamer used if n = 23
= 6 n + 15
= 6(23) + 15
= 138 + 15
= 153 cm
Total length of streamer not used
= 390 - 153
= 237 cm
1 cm = 0.01 m
237 cm = 2.37 m
Answer(s): (a) (6n + 15) cm; (b) 2.37 m