PSLELuis had 2.4 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 x.
- If x = 15, how much of the wire was not used to make the figure? Leave your answer in meters.
(a)
Total length of wire used
= x + x + x + (3x - 7) + (x + 19)
= x + x + x + 3x + x - 7 + 19
= (7 x + 12) cm
(b)
1 m = 100 cm
2.4 m = 240 cm
Total length of wire used if x = 15
= 7 x + 12
= 7(15) + 12
= 105 + 12
= 117 cm
Total length of wire not used
= 240 - 117
= 123 cm
1 cm = 0.01 m
123 cm = 1.23 m
Answer(s): (a) (7x + 12) cm; (b) 1.23 m