PSLEGabriel had 1.9 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 = 10, 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 - 6) + (z + 11)
= z + z + z + 2z + z - 6 + 11
= (6 z + 5) cm
(b)
1 m = 100 cm
1.9 m = 190 cm
Total length of wire used if z = 10
= 6 z + 5
= 6(10) + 5
= 60 + 5
= 65 cm
Total length of wire not used
= 190 - 65
= 125 cm
1 cm = 0.01 m
125 cm = 1.25 m
Answer(s): (a) (6z + 5) cm; (b) 1.25 m