Identify the variation as direct, inverse, joint or combined.

v = rrah

direct

inverse

joint

combined

Third option.

Step-by-step explanation:

For this exercise it is important to remember that, by definition, a Joint variation is that variation in which one variable depends on two or more variables and  there are a direct relation between these variables.

In this case, you have the following equation given in the exercise:

 Let's assume that "r" and "h" are variables.

You can identify that:

So, based on this, the variation can be read as:

"V" varies jointly with the square of "r" and "h".

Therefore, you can conclude that the  given variation is: Joint.

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