PSLECharlie had 2.5 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 = 16, 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 - 9) + (i + 12)
= i + i + i + 3i + i - 9 + 12
= (7 i + 3) cm
(b)
1 m = 100 cm
2.5 m = 250 cm
Total length of ribbon used if i = 16
= 7 i + 3
= 7(16) + 3
= 112 + 3
= 115 cm
Total length of ribbon not used
= 250 - 115
= 135 cm
1 cm = 0.01 m
135 cm = 1.35 m
Answer(s): (a) (7i + 3) cm; (b) 1.35 m