PSLEHoward 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 b.
- If b = 12, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= b + b + b + (3b - 7) + (b + 17)
= b + b + b + 3b + b - 7 + 17
= (7 b + 10) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of streamer used if b = 12
= 7 b + 10
= 7(12) + 10
= 84 + 10
= 94 cm
Total length of streamer not used
= 380 - 94
= 286 cm
1 cm = 0.01 m
286 cm = 2.86 m
Answer(s): (a) (7b + 10) cm; (b) 2.86 m