PSLEJustin had 3.9 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 h.
- If h = 25, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= h + h + h + (3h - 4) + (h + 14)
= h + h + h + 3h + h - 4 + 14
= (7 h + 10) cm
(b)
1 m = 100 cm
3.9 m = 390 cm
Total length of wire used if h = 25
= 7 h + 10
= 7(25) + 10
= 175 + 10
= 185 cm
Total length of wire not used
= 390 - 185
= 205 cm
1 cm = 0.01 m
205 cm = 2.05 m
Answer(s): (a) (7h + 10) cm; (b) 2.05 m