PSLECarl had 2.1 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 = 11, 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 - 5) + (x + 13)
= x + x + x + 2x + x - 5 + 13
= (6 x + 8) cm
(b)
1 m = 100 cm
2.1 m = 210 cm
Total length of thread used if x = 11
= 6 x + 8
= 6(11) + 8
= 66 + 8
= 74 cm
Total length of thread not used
= 210 - 74
= 136 cm
1 cm = 0.01 m
136 cm = 1.36 m
Answer(s): (a) (6x + 8) cm; (b) 1.36 m