(b) A circle has center $(0,2)$ and goes through the point $(1,4)$. Find the equation of this circle.

(c) Find all points of intersection (if there are any) between the line from (a) and the circle from (b).

Consider the function $f(x) = \frac{x^2 - 4x}{x^2 - 4}$. Determine the domain, intercepts, and vertical and horizontal asymptoes. (Include computation of limits at vertical asymptoes.) Determine also any points where the graph of $y = f(x)$ intersects its horizontal asymptote. Then sketch the graph of this function on which all obtained points and asymptotes are clearly marked.

Compute the following limits. Give each answer as a finite number, +$\infty$, or -$\infty$

(a) $\lim_{x \to 4} \frac{\sqrt{x + 5}}{\sqrt{x - 3}}$

(a) $\lim_{x \to 4} \frac{\sqrt{x + 5}}{\sqrt{x - 3}}$

In all parts of this problem,

(a) Determine the domain of the function $y = f(x)$.

(a) Determine the domain of the function $y = f(x)$.

(c) A line is tangent to the graph of $y = f(x)$ and perpendicular to the line $x+3y+7=0$. Determine the equation of this line (in the slope-intercept form).

(d) Discuss continuity and differentiability of $y =
g(x)$, and determine the range of this function.

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