PSLEDavid had 2.1 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 i.
- If i = 14, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= i + i + i + (3i - 10) + (i + 19)
= i + i + i + 3i + i - 10 + 19
= (7 i + 9) cm
(b)
1 m = 100 cm
2.1 m = 210 cm
Total length of streamer used if i = 14
= 7 i + 9
= 7(14) + 9
= 98 + 9
= 107 cm
Total length of streamer not used
= 210 - 107
= 103 cm
1 cm = 0.01 m
103 cm = 1.03 m
Answer(s): (a) (7i + 9) cm; (b) 1.03 m