PSLEVincent had 3.7 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 z.
- If z = 15, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= z + z + z + (3z - 6) + (z + 16)
= z + z + z + 3z + z - 6 + 16
= (7 z + 10) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of streamer used if z = 15
= 7 z + 10
= 7(15) + 10
= 105 + 10
= 115 cm
Total length of streamer not used
= 370 - 115
= 255 cm
1 cm = 0.01 m
255 cm = 2.55 m
Answer(s): (a) (7z + 10) cm; (b) 2.55 m