PSLEHarry had 2.6 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 = 18, 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 - 6) + (i + 18)
= i + i + i + 3i + i - 6 + 18
= (7 i + 12) cm
(b)
1 m = 100 cm
2.6 m = 260 cm
Total length of ribbon used if i = 18
= 7 i + 12
= 7(18) + 12
= 126 + 12
= 138 cm
Total length of ribbon not used
= 260 - 138
= 122 cm
1 cm = 0.01 m
122 cm = 1.22 m
Answer(s): (a) (7i + 12) cm; (b) 1.22 m