PSLEAsher 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 x.
- If x = 25, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= x + x + x + (3x - 8) + (x + 20)
= x + x + x + 3x + x - 8 + 20
= (7 x + 12) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of rope used if x = 25
= 7 x + 12
= 7(25) + 12
= 175 + 12
= 187 cm
Total length of rope not used
= 320 - 187
= 133 cm
1 cm = 0.01 m
133 cm = 1.33 m
Answer(s): (a) (7x + 12) cm; (b) 1.33 m