PSLECharlie had 2.8 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 a.
- If a = 18, 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 + 19)
= a + a + a + 2a + a - 9 + 19
= (6 a + 10) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of streamer used if a = 18
= 6 a + 10
= 6(18) + 10
= 108 + 10
= 118 cm
Total length of streamer not used
= 280 - 118
= 162 cm
1 cm = 0.01 m
162 cm = 1.62 m
Answer(s): (a) (6a + 10) cm; (b) 1.62 m