PSLEValen had 3.2 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 a.
- If a = 30, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= a + a + a + (2a - 9) + (a + 12)
= a + a + a + 2a + a - 9 + 12
= (6 a + 3) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of streamer used if a = 30
= 6 a + 3
= 6(30) + 3
= 180 + 3
= 183 cm
Total length of streamer not used
= 320 - 183
= 137 cm
1 cm = 0.01 m
137 cm = 1.37 m
Answer(s): (a) (6a + 3) cm; (b) 1.37 m