PSLEAlbert had 2.8 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 v.
- If v = 23, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= v + v + v + (2v - 3) + (v + 12)
= v + v + v + 2v + v - 3 + 12
= (6 v + 9) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of thread used if v = 23
= 6 v + 9
= 6(23) + 9
= 138 + 9
= 147 cm
Total length of thread not used
= 280 - 147
= 133 cm
1 cm = 0.01 m
133 cm = 1.33 m
Answer(s): (a) (6v + 9) cm; (b) 1.33 m