PSLEXavier had 2.9 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 n.
- If n = 26, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= n + n + n + (2n - 5) + (n + 17)
= n + n + n + 2n + n - 5 + 17
= (6 n + 12) cm
(b)
1 m = 100 cm
2.9 m = 290 cm
Total length of string used if n = 26
= 6 n + 12
= 6(26) + 12
= 156 + 12
= 168 cm
Total length of string not used
= 290 - 168
= 122 cm
1 cm = 0.01 m
122 cm = 1.22 m
Answer(s): (a) (6n + 12) cm; (b) 1.22 m