PSLEIvan had 3.1 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 w.
- If w = 14, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= w + w + w + (2w - 7) + (w + 17)
= w + w + w + 2w + w - 7 + 17
= (6 w + 10) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of ribbon used if w = 14
= 6 w + 10
= 6(14) + 10
= 84 + 10
= 94 cm
Total length of ribbon not used
= 310 - 94
= 216 cm
1 cm = 0.01 m
216 cm = 2.16 m
Answer(s): (a) (6w + 10) cm; (b) 2.16 m