For this case we have the following expression:[tex]\frac {b ^ 7} {b ^ 6}[/tex]By definition of division of powers of the same base, we have to place the same base and subtract the exponents, that is:[tex]\frac {a ^ m} {a ^ n} = a ^ {n-m}[/tex]So:[tex]\frac {b ^ 7} {b ^ 6} = b ^ {7-6} = b ^ 1 = b[/tex]Answer:b