PSLEWesley had 2.4 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 i.
- If i = 15, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= i + i + i + (2i - 8) + (i + 19)
= i + i + i + 2i + i - 8 + 19
= (6 i + 11) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of thread used if i = 15
= 6 i + 11
= 6(15) + 11
= 90 + 11
= 101 cm
Total length of thread not used
= 240 - 101
= 139 cm
1 cm = 0.01 m
139 cm = 1.39 m
Answer(s): (a) (6i + 11) cm; (b) 1.39 m