PSLEJapheth had 3.9 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 f.
- If f = 25, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= f + f + f + (2f - 4) + (f + 18)
= f + f + f + 2f + f - 4 + 18
= (6 f + 14) cm
(b)
1 m = 100 cm
3.9 m = 390 cm
Total length of rope used if f = 25
= 6 f + 14
= 6(25) + 14
= 150 + 14
= 164 cm
Total length of rope not used
= 390 - 164
= 226 cm
1 cm = 0.01 m
226 cm = 2.26 m
Answer(s): (a) (6f + 14) cm; (b) 2.26 m