PSLEJenson had 3.7 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 z.
- If z = 12, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= z + z + z + (2z - 7) + (z + 18)
= z + z + z + 2z + z - 7 + 18
= (6 z + 11) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of wire used if z = 12
= 6 z + 11
= 6(12) + 11
= 72 + 11
= 83 cm
Total length of wire not used
= 370 - 83
= 287 cm
1 cm = 0.01 m
287 cm = 2.87 m
Answer(s): (a) (6z + 11) cm; (b) 2.87 m