PSLELuis 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 g.
- If g = 16, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= g + g + g + (3g - 7) + (g + 15)
= g + g + g + 3g + g - 7 + 15
= (7 g + 8) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of wire used if g = 16
= 7 g + 8
= 7(16) + 8
= 112 + 8
= 120 cm
Total length of wire not used
= 280 - 120
= 160 cm
1 cm = 0.01 m
160 cm = 1.6 m
Answer(s): (a) (7g + 8) cm; (b) 1.6 m