PSLEOscar had 2.1 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 q.
- If q = 11, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= q + q + q + (3q - 5) + (q + 19)
= q + q + q + 3q + q - 5 + 19
= (7 q + 14) cm
(b)
1 m = 100 cm
2.1 m = 210 cm
Total length of wire used if q = 11
= 7 q + 14
= 7(11) + 14
= 77 + 14
= 91 cm
Total length of wire not used
= 210 - 91
= 119 cm
1 cm = 0.01 m
119 cm = 1.19 m
Answer(s): (a) (7q + 14) cm; (b) 1.19 m