PSLEWesley had 2.9 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 k.
- If k = 15, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= k + k + k + (3k - 6) + (k + 14)
= k + k + k + 3k + k - 6 + 14
= (7 k + 8) cm
(b)
1 m = 100 cm
2.9 m = 290 cm
Total length of thread used if k = 15
= 7 k + 8
= 7(15) + 8
= 105 + 8
= 113 cm
Total length of thread not used
= 290 - 113
= 177 cm
1 cm = 0.01 m
177 cm = 1.77 m
Answer(s): (a) (7k + 8) cm; (b) 1.77 m