PSLESeth had 3.3 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 a.
- If a = 10, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= a + a + a + (2a - 7) + (a + 15)
= a + a + a + 2a + a - 7 + 15
= (6 a + 8) cm
(b)
1 m = 100 cm
3.3 m = 330 cm
Total length of thread used if a = 10
= 6 a + 8
= 6(10) + 8
= 60 + 8
= 68 cm
Total length of thread not used
= 330 - 68
= 262 cm
1 cm = 0.01 m
262 cm = 2.62 m
Answer(s): (a) (6a + 8) cm; (b) 2.62 m