I have this due like now so pls explanation and answer

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours

the answer for the question that you are asking is 4