PSLECarl had 2.2 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 y.
- If y = 15, how much of the string was not used to make the figure? Leave your answer in meters.
(a)
Total length of string used
= y + y + y + (2y - 10) + (y + 17)
= y + y + y + 2y + y - 10 + 17
= (6 y + 7) cm
(b)
1 m = 100 cm
2.2 m = 220 cm
Total length of string used if y = 15
= 6 y + 7
= 6(15) + 7
= 90 + 7
= 97 cm
Total length of string not used
= 220 - 97
= 123 cm
1 cm = 0.01 m
123 cm = 1.23 m
Answer(s): (a) (6y + 7) cm; (b) 1.23 m