PSLECharlie had 3.5 m of ribbon. He used some of it to make the figure as shown.
- How much of the ribbon did Andy use to make the figure? Leave your answer in the simplest form in terms of z.
- If z = 25, how much of the ribbon was not used to make the figure? Leave your answer in meters.
(a)
Total length of ribbon used
= z + z + z + (3z - 9) + (z + 16)
= z + z + z + 3z + z - 9 + 16
= (7 z + 7) cm
(b)
1 m = 100 cm
3.5 m = 350 cm
Total length of ribbon used if z = 25
= 7 z + 7
= 7(25) + 7
= 175 + 7
= 182 cm
Total length of ribbon not used
= 350 - 182
= 168 cm
1 cm = 0.01 m
168 cm = 1.68 m
Answer(s): (a) (7z + 7) cm; (b) 1.68 m