PSLEElijah had 3.7 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 k.
- If k = 16, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= k + k + k + (2k - 9) + (k + 12)
= k + k + k + 2k + k - 9 + 12
= (6 k + 3) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of string used if k = 16
= 6 k + 3
= 6(16) + 3
= 96 + 3
= 99 cm
Total length of string not used
= 370 - 99
= 271 cm
1 cm = 0.01 m
271 cm = 2.71 m
Answer(s): (a) (6k + 3) cm; (b) 2.71 m