PSLEBen had 3.1 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 = 22, 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 - 7) + (h + 17)
= h + h + h + 3h + h - 7 + 17
= (7 h + 10) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of wire used if h = 22
= 7 h + 10
= 7(22) + 10
= 154 + 10
= 164 cm
Total length of wire not used
= 310 - 164
= 146 cm
1 cm = 0.01 m
146 cm = 1.46 m
Answer(s): (a) (7h + 10) cm; (b) 1.46 m