Multiplication and distributive property are your friends for this problen
H=v/(2pir)
You just have to isolate h. To do that you are going to divide both sides by 2pir.
Answer:
Step-by-step explanation:

There is infinitely many ratios which are equivalent to 5:9. As we know always we can write divide as fraction, so

. We can multiply nominator and denominator by the any number (but the same) and get another numbers but ratio will be the same, so equivalent.
For example
10:18,
15:27