PSLEVincent had 2.6 m of streamer. He used some of it to make the figure as shown.
- How much of the streamer 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 streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= f + f + f + (2f - 5) + (f + 20)
= f + f + f + 2f + f - 5 + 20
= (6 f + 15) cm
(b)
1 m = 100 cm
2.6 m = 260 cm
Total length of streamer used if f = 21
= 6 f + 15
= 6(21) + 15
= 126 + 15
= 141 cm
Total length of streamer not used
= 260 - 141
= 119 cm
1 cm = 0.01 m
119 cm = 1.19 m
Answer(s): (a) (6f + 15) cm; (b) 1.19 m