Answer:
B
Step-by-step explanation:
given 625 = [tex]5^{(7x-3)}[/tex]
note that 625 = [tex]5^{4}[/tex], hence
[tex]5^{4}[/tex] = [tex]5^{7x-3}[/tex]
Since bases on both sides of the equation are equal then we can equate the exponents, hence
7x - 3 = 4 ( add 3 to both sides )
7x = 7 ( divide both sides by 7 )
x = 1 → B
