PSLERyan had 2.8 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 = 16, 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 + (3y - 6) + (y + 19)
= y + y + y + 3y + y - 6 + 19
= (7 y + 13) cm
(b)
1 m = 100 cm
2.8 m = 280 cm
Total length of string used if y = 16
= 7 y + 13
= 7(16) + 13
= 112 + 13
= 125 cm
Total length of string not used
= 280 - 125
= 155 cm
1 cm = 0.01 m
155 cm = 1.55 m
Answer(s): (a) (7y + 13) cm; (b) 1.55 m