What is the value of x ?

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

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.