PSLEGlen 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 = 17, 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 - 10) + (a + 15)
= a + a + a + 3a + a - 10 + 15
= (7 a + 5) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of streamer used if a = 17
= 7 a + 5
= 7(17) + 5
= 119 + 5
= 124 cm
Total length of streamer not used
= 320 - 124
= 196 cm
1 cm = 0.01 m
196 cm = 1.96 m
Answer(s): (a) (7a + 5) cm; (b) 1.96 m