PSLEAlbert had 3.4 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 r.
- If r = 14, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= r + r + r + (3r - 5) + (r + 19)
= r + r + r + 3r + r - 5 + 19
= (7 r + 14) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of rope used if r = 14
= 7 r + 14
= 7(14) + 14
= 98 + 14
= 112 cm
Total length of rope not used
= 340 - 112
= 228 cm
1 cm = 0.01 m
228 cm = 2.28 m
Answer(s): (a) (7r + 14) cm; (b) 2.28 m