Elio is right in assuming the relationship between the height and the hours it burns is proportional.
Find the unit rate
14 ÷ 8 = 1.75 cm/h
Divide
21 ÷ 1.75 = 12
You can set this up as an algebraic equation to check the answer.
If the candle is 21 cm tall, it will burn for 12 hours.
Hope this helped you! :)
Answer:

Step-by-step explanation:
1) Subtract 1 from both sides.

2) Simplify 7 - 1 to 6.

<u>Therefor, the answer is </u><u>a > 6</u>.
Answer:
2
Step-by-step explanation:
Hope this helps, been doing it all my life! :P