PSLEJulian had 2.8 m of wire. He used some of it to make the figure as shown.
- How much of the wire did Andy use to make the figure? Leave your answer in the simplest form in terms of f.
- If f = 12, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= f + f + f + (3f - 7) + (f + 20)
= f + f + f + 3f + f - 7 + 20
= (7 f + 13) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of wire used if f = 12
= 7 f + 13
= 7(12) + 13
= 84 + 13
= 97 cm
Total length of wire not used
= 280 - 97
= 183 cm
1 cm = 0.01 m
183 cm = 1.83 m
Answer(s): (a) (7f + 13) cm; (b) 1.83 m