PSLEWesley had 2.4 m of string. He used some of it to make the figure as shown.
- How much of the string did Andy use to make the figure? Leave your answer in the simplest form in terms of w.
- If w = 10, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= w + w + w + (2w - 7) + (w + 14)
= w + w + w + 2w + w - 7 + 14
= (6 w + 7) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of string used if w = 10
= 6 w + 7
= 6(10) + 7
= 60 + 7
= 67 cm
Total length of string not used
= 240 - 67
= 173 cm
1 cm = 0.01 m
173 cm = 1.73 m
Answer(s): (a) (6w + 7) cm; (b) 1.73 m