PSLEXavier had 3.6 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 y.
- If y = 20, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= y + y + y + (2y - 6) + (y + 16)
= y + y + y + 2y + y - 6 + 16
= (6 y + 10) cm
(b)
1 m = 100 cm
3.6 m = 360 cm
Total length of streamer used if y = 20
= 6 y + 10
= 6(20) + 10
= 120 + 10
= 130 cm
Total length of streamer not used
= 360 - 130
= 230 cm
1 cm = 0.01 m
230 cm = 2.3 m
Answer(s): (a) (6y + 10) cm; (b) 2.3 m