PSLECarl had 3.2 m of ribbon. He used some of it to make the figure as shown.
- How much of the ribbon did Andy use to make the figure? Leave your answer in the simplest form in terms of i.
- If i = 13, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= i + i + i + (3i - 3) + (i + 17)
= i + i + i + 3i + i - 3 + 17
= (7 i + 14) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of ribbon used if i = 13
= 7 i + 14
= 7(13) + 14
= 91 + 14
= 105 cm
Total length of ribbon not used
= 320 - 105
= 215 cm
1 cm = 0.01 m
215 cm = 2.15 m
Answer(s): (a) (7i + 14) cm; (b) 2.15 m