PSLELiam had 2.3 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 r.
- If r = 11, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= r + r + r + (3r - 7) + (r + 14)
= r + r + r + 3r + r - 7 + 14
= (7 r + 7) cm
(b)
1 m = 100 cm
2.3 m = 230 cm
Total length of streamer used if r = 11
= 7 r + 7
= 7(11) + 7
= 77 + 7
= 84 cm
Total length of streamer not used
= 230 - 84
= 146 cm
1 cm = 0.01 m
146 cm = 1.46 m
Answer(s): (a) (7r + 7) cm; (b) 1.46 m