PSLEAlbert had 3.7 m of string. He used some of it to make the figure as shown.
- How much of the string 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 string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= i + i + i + (3i - 5) + (i + 13)
= i + i + i + 3i + i - 5 + 13
= (7 i + 8) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of string used if i = 18
= 7 i + 8
= 7(18) + 8
= 126 + 8
= 134 cm
Total length of string not used
= 370 - 134
= 236 cm
1 cm = 0.01 m
236 cm = 2.36 m
Answer(s): (a) (7i + 8) cm; (b) 2.36 m