PSLEBilly had 3.7 m of wire. He used some of it to make the figure as shown.
- How much of the wire did Andy use to make the figure? Leave your answer in the simplest form in terms of s.
- If s = 30, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= s + s + s + (3s - 9) + (s + 17)
= s + s + s + 3s + s - 9 + 17
= (7 s + 8) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of wire used if s = 30
= 7 s + 8
= 7(30) + 8
= 210 + 8
= 218 cm
Total length of wire not used
= 370 - 218
= 152 cm
1 cm = 0.01 m
152 cm = 1.52 m
Answer(s): (a) (7s + 8) cm; (b) 1.52 m