SOLUTION: i really don't understand how to solve for r in the equation r=(ab)/(a+b)

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Question 249942: i really don't understand how to solve for r in the equation r=(ab)/(a+b)
Answer by College Student(505) About Me  (Show Source):
You can put this solution on YOUR website!
The equation is already set in "solve for r" form.

However, we cannot go further without knowing the values of "a" and "b".