Answer:
A. log(7)/log(5)
Explanation:
You want the solution to 2(5^x) = 14.
Logarithms
We can get the exponential term by itself by dividing both sides by 2:
5^x = 7
Taking logs gives ...
x·log(5) = log(7)
x = log(7)/log(5) . . . . . . . divide by the coefficient of x
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Additional comment
The rules of logarithms tell you ...
log(a^b) = b·log(a)
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