PSLECharlie had 2.3 m of string. He used some of it to make the figure as shown.
- How much of the string did Andy use to make the figure? Leave your answer in the simplest form in terms of z.
- If z = 14, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= z + z + z + (2z - 3) + (z + 16)
= z + z + z + 2z + z - 3 + 16
= (6 z + 13) cm
(b)
1 m = 100 cm
2.3 m = 230 cm
Total length of string used if z = 14
= 6 z + 13
= 6(14) + 13
= 84 + 13
= 97 cm
Total length of string not used
= 230 - 97
= 133 cm
1 cm = 0.01 m
133 cm = 1.33 m
Answer(s): (a) (6z + 13) cm; (b) 1.33 m