to calculate a seller's rating, $R$, based on the number of favorable reviews, $F$, and unfavorable reviews, $N$. Which of the following expresses the number of favorable reviews in terms of the other variables?
A) $F=\frac{R N}{R-1}$
B) $F=\frac{R N}{1-R}$
C) $F=\frac{N}{1-R}$
D) $F=\frac{N}{R-1}$

Answer

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Answer

3. The final answer is: $\boxed{F=\frac{R N}{R-1}}$

Steps

Step 1 ：1. Start with the given equation for the seller's rating: $R = \frac{F}{F + N}$

Step 2 ：2. Solve the equation for F in terms of R and N: $F = \frac{R N}{R-1}$

Step 3 ：3. The final answer is: $\boxed{F=\frac{R N}{R-1}}$