PSLEEric had 3.2 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of n.
- If n = 18, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= n + n + n + (3n - 4) + (n + 19)
= n + n + n + 3n + n - 4 + 19
= (7 n + 15) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of rope used if n = 18
= 7 n + 15
= 7(18) + 15
= 126 + 15
= 141 cm
Total length of rope not used
= 320 - 141
= 179 cm
1 cm = 0.01 m
179 cm = 1.79 m
Answer(s): (a) (7n + 15) cm; (b) 1.79 m