PSLEHenry had 3.5 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 k.
- If k = 13, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= k + k + k + (3k - 9) + (k + 18)
= k + k + k + 3k + k - 9 + 18
= (7 k + 9) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of wire used if k = 13
= 7 k + 9
= 7(13) + 9
= 91 + 9
= 100 cm
Total length of wire not used
= 350 - 100
= 250 cm
1 cm = 0.01 m
250 cm = 2.5 m
Answer(s): (a) (7k + 9) cm; (b) 2.5 m