PSLEGlen had 3.7 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 = 20, 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 + (3z - 4) + (z + 14)
= z + z + z + 3z + z - 4 + 14
= (7 z + 10) cm
(b)
1 m = 100 cm
3.7 m = 370 cm
Total length of string used if z = 20
= 7 z + 10
= 7(20) + 10
= 140 + 10
= 150 cm
Total length of string not used
= 370 - 150
= 220 cm
1 cm = 0.01 m
220 cm = 2.2 m
Answer(s): (a) (7z + 10) cm; (b) 2.2 m