PSLEAhmad had 3.1 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 z.
- If z = 23, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= z + z + z + (3z - 4) + (z + 14)
= z + z + z + 3z + z - 4 + 14
= (7 z + 10) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of rope used if z = 23
= 7 z + 10
= 7(23) + 10
= 161 + 10
= 171 cm
Total length of rope not used
= 310 - 171
= 139 cm
1 cm = 0.01 m
139 cm = 1.39 m
Answer(s): (a) (7z + 10) cm; (b) 1.39 m