PSLEFred 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 d.
- If d = 14, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= d + d + d + (2d - 9) + (d + 12)
= d + d + d + 2d + d - 9 + 12
= (6 d + 3) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of ribbon used if d = 14
= 6 d + 3
= 6(14) + 3
= 84 + 3
= 87 cm
Total length of ribbon not used
= 310 - 87
= 223 cm
1 cm = 0.01 m
223 cm = 2.23 m
Answer(s): (a) (6d + 3) cm; (b) 2.23 m