Answer
\[\$6,698.56\].
Work Step by Step
Compute the principal amount by substituting the values in the formula as mentioned below:
\[\begin{align}
& \text{P=}\frac{A}{1+rt} \\
& =\frac{\$7,000}{1+\left(0.09\times0.5\right)}\\&=\frac{\$7,000}{1+0.045}\\&=\$6,698.56\end{align}\]
Hence, the principal amount is\[\$6,698.56\].
