Final answer:
The value of x is log16(19) + 7.
Therefore, the correct answer is: option "x = log_16(19) + 7".
Step-by-step explanation:
To solve the equation 16^(x - 7) + 5 = 24, we can start by subtracting 5 from both sides to isolate the exponent term: 16^(x-7) = 19. 
To solve for x, we can take the logarithm of both sides using logarithm properties. 
Taking the logarithm base 16 of both sides gives us: 
log16(16^(x-7)) = log16(19). 
Applying the logarithm property x logb(a) = logb(a^x), we have: 
(x-7)log16(16) = log16(19). 
Since the logarithm base 16 of 16 is 1, we have: 
x-7 = log16(19). 
Finally, we can solve for x by adding 7 to both sides: x = log16(19) + 7.