PSLEVaidev had 3.8 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 j.
- If j = 28, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= j + j + j + (2j - 3) + (j + 14)
= j + j + j + 2j + j - 3 + 14
= (6 j + 11) cm
(b)
1 m = 100 cm
3.8 m = 380 cm
Total length of wire used if j = 28
= 6 j + 11
= 6(28) + 11
= 168 + 11
= 179 cm
Total length of wire not used
= 380 - 179
= 201 cm
1 cm = 0.01 m
201 cm = 2.01 m
Answer(s): (a) (6j + 11) cm; (b) 2.01 m