PSLERael 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 m.
- If m = 17, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= m + m + m + (3m - 5) + (m + 17)
= m + m + m + 3m + m - 5 + 17
= (7 m + 12) cm
(b)
1 m = 100 cm
3.2 m = 320 cm
Total length of string used if m = 17
= 7 m + 12
= 7(17) + 12
= 119 + 12
= 131 cm
Total length of string not used
= 320 - 131
= 189 cm
1 cm = 0.01 m
189 cm = 1.89 m
Answer(s): (a) (7m + 12) cm; (b) 1.89 m