Estimate the value of 44.08 / (79.06 - 19.54) to 2 significant figures and calculate the percentage error.

• $44.08 \approx 44$
• $79.06 \approx 79$
• $19.54 \approx 20$

The formula for percentage error is $\left| \frac{\text{Actual Value} - \text{Estimated Value}}{\text{Actual Value}} \right| \times 100\%$.

The estimated value is $\boxed{0.74576}$ and the percentage error is $\boxed{0.698\%}$.

The given equation is $x^2 + y^2 + 6x - 8y - 2 = 0$.

For $x^2 + 6x$, add $\left(\frac{6}{2}\right)^2 = 3^2 = 9$.
For $y^2 - 8y$, add $\left(\frac{-8}{2}\right)^2 = (-4)^2 = 16$.
Add these values to both sides of the equation.

The standard form of a circle's equation is $(x-h)^2 + (y-k)^2 = r^2$, where $(h,k)$ is the center and $r$ is the radius.
Comparing with $(x + 3)^2 + (y - 4)^2 = 27$:
The center $(h,k)$ is $(-3, 4)$.
The radius squared $r^2 = 27$, so the radius $r = \sqrt{27} = \sqrt{9 \times 3} = 3\sqrt{3}$.

The coordinates of the center are $\boxed{(-3, 4)}$ and the radius is $\boxed{3\sqrt{3}}$.