PSLETom had 3.5 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 j.
- If j = 21, how much of the streamer was not used to make the figure? Leave your answer in meters.
(a)
Total length of streamer used
= j + j + j + (2j - 8) + (j + 14)
= j + j + j + 2j + j - 8 + 14
= (6 j + 6) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of streamer used if j = 21
= 6 j + 6
= 6(21) + 6
= 126 + 6
= 132 cm
Total length of streamer not used
= 350 - 132
= 218 cm
1 cm = 0.01 m
218 cm = 2.18 m
Answer(s): (a) (6j + 6) cm; (b) 2.18 m