To rewrite the equation \( 35 = 243 \) as a logarithmic equation, you need to express it in the form of \( \log_b(a) = c \).
In this case, for an exponential equation of the form \( b^c = a \), we can rewrite it as \( \log_b(a) = c \).
Here, \( b \) (the base) is 3, \( c \) (the exponent) is 5, and \( a \) (the result of the exponentiation) is 243. Therefore, we can identify the following:
- The base \( b \) is 3.
- The exponent \( c \) is 5.
- The result \( a \) is 243.
So the corresponding logarithmic equation is:
\[ \log_3(243) = 5 \]
Thus, Fernando should use the number 5 as the value when rewriting the equation.