PSLEGabriel 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 = 12, 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 + (3a - 9) + (a + 16)
= a + a + a + 3a + a - 9 + 16
= (7 a + 7) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of streamer used if a = 12
= 7 a + 7
= 7(12) + 7
= 84 + 7
= 91 cm
Total length of streamer not used
= 280 - 91
= 189 cm
1 cm = 0.01 m
189 cm = 1.89 m
Answer(s): (a) (7a + 7) cm; (b) 1.89 m