PSLEPaul had 3.2 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 = 30, 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 + (3z - 5) + (z + 14)
= z + z + z + 3z + z - 5 + 14
= (7 z + 9) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of thread used if z = 30
= 7 z + 9
= 7(30) + 9
= 210 + 9
= 219 cm
Total length of thread not used
= 320 - 219
= 101 cm
1 cm = 0.01 m
101 cm = 1.01 m
Answer(s): (a) (7z + 9) cm; (b) 1.01 m