PSLECole had 2.4 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 j.
- If j = 14, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= j + j + j + (2j - 4) + (j + 20)
= j + j + j + 2j + j - 4 + 20
= (6 j + 16) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of rope used if j = 14
= 6 j + 16
= 6(14) + 16
= 84 + 16
= 100 cm
Total length of rope not used
= 240 - 100
= 140 cm
1 cm = 0.01 m
140 cm = 1.4 m
Answer(s): (a) (6j + 16) cm; (b) 1.4 m