PSLETim had 3.1 m of rope. He used some of it to make the figure as shown.
- How much of the rope did Andy use to make the figure? Leave your answer in the simplest form in terms of y.
- If y = 19, how much of the rope was not used to make the figure? Leave your answer in meters.
(a)
Total length of rope used
= y + y + y + (2y - 3) + (y + 11)
= y + y + y + 2y + y - 3 + 11
= (6 y + 8) cm
(b)
1 m = 100 cm
3.1 m = 310 cm
Total length of rope used if y = 19
= 6 y + 8
= 6(19) + 8
= 114 + 8
= 122 cm
Total length of rope not used
= 310 - 122
= 188 cm
1 cm = 0.01 m
188 cm = 1.88 m
Answer(s): (a) (6y + 8) cm; (b) 1.88 m