PSLEHarry had 3.4 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of z.
- If z = 10, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= z + z + z + (2z - 7) + (z + 16)
= z + z + z + 2z + z - 7 + 16
= (6 z + 9) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of thread used if z = 10
= 6 z + 9
= 6(10) + 9
= 60 + 9
= 69 cm
Total length of thread not used
= 340 - 69
= 271 cm
1 cm = 0.01 m
271 cm = 2.71 m
Answer(s): (a) (6z + 9) cm; (b) 2.71 m