PSLEPaul had 3.2 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 e.
- If e = 17, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= e + e + e + (2e - 4) + (e + 15)
= e + e + e + 2e + e - 4 + 15
= (6 e + 11) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of string used if e = 17
= 6 e + 11
= 6(17) + 11
= 102 + 11
= 113 cm
Total length of string not used
= 320 - 113
= 207 cm
1 cm = 0.01 m
207 cm = 2.07 m
Answer(s): (a) (6e + 11) cm; (b) 2.07 m