PSLEBrandon had 3.3 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 c.
- If c = 11, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= c + c + c + (3c - 5) + (c + 15)
= c + c + c + 3c + c - 5 + 15
= (7 c + 10) cm
(b)
1 m = 100 cm
3.3 m = 330 cm
Total length of wire used if c = 11
= 7 c + 10
= 7(11) + 10
= 77 + 10
= 87 cm
Total length of wire not used
= 330 - 87
= 243 cm
1 cm = 0.01 m
243 cm = 2.43 m
Answer(s): (a) (7c + 10) cm; (b) 2.43 m