PSLENick had 2.8 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 f.
- If f = 21, how much of the thread was not used to make the figure? Leave your answer in meters.
(a)
Total length of thread used
= f + f + f + (2f - 9) + (f + 13)
= f + f + f + 2f + f - 9 + 13
= (6 f + 4) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of thread used if f = 21
= 6 f + 4
= 6(21) + 4
= 126 + 4
= 130 cm
Total length of thread not used
= 280 - 130
= 150 cm
1 cm = 0.01 m
150 cm = 1.5 m
Answer(s): (a) (6f + 4) cm; (b) 1.5 m