PSLELiam had 2.5 m of thread. He used some of it to make the figure as shown.
- How much of the thread did Andy use to make the figure? Leave your answer in the simplest form in terms of x.
- If x = 13, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= x + x + x + (2x - 10) + (x + 17)
= x + x + x + 2x + x - 10 + 17
= (6 x + 7) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of thread used if x = 13
= 6 x + 7
= 6(13) + 7
= 78 + 7
= 85 cm
Total length of thread not used
= 250 - 85
= 165 cm
1 cm = 0.01 m
165 cm = 1.65 m
Answer(s): (a) (6x + 7) cm; (b) 1.65 m