PSLEXavier had 2.2 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 k.
- If k = 12, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= k + k + k + (2k - 3) + (k + 20)
= k + k + k + 2k + k - 3 + 20
= (6 k + 17) cm
(b)
1 m = 100 cm
2.2 m = 220 cm
Total length of ribbon used if k = 12
= 6 k + 17
= 6(12) + 17
= 72 + 17
= 89 cm
Total length of ribbon not used
= 220 - 89
= 131 cm
1 cm = 0.01 m
131 cm = 1.31 m
Answer(s): (a) (6k + 17) cm; (b) 1.31 m