PSLEBobby had 3.4 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 = 22, 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 + (2i - 6) + (i + 13)
= i + i + i + 2i + i - 6 + 13
= (6 i + 7) cm
(b)
1 m = 100 cm
3.4 m = 340 cm
Total length of ribbon used if i = 22
= 6 i + 7
= 6(22) + 7
= 132 + 7
= 139 cm
Total length of ribbon not used
= 340 - 139
= 201 cm
1 cm = 0.01 m
201 cm = 2.01 m
Answer(s): (a) (6i + 7) cm; (b) 2.01 m