1. **State the problem:** We are given two functions $f(x)$ and $g(x)$ from graphs and asked to find various limits involving these functions.
2. **Recall limit rules:** The limit of a sum is the sum of the limits if both limits exist.
3. **Analyze each limit:**
(a) $\lim_{x \to 2} [f(x) + g(x)]$:
- From the graphs, $f(2)$ approaches 3 (since the line continues upward through (1,1) and beyond, assume $f(2)=3$).
- $g(2)$ approaches 1 (assuming linear continuation).
- So, $\lim_{x \to 2} f(x) = 3$, $\lim_{x \to 2} g(x) = 1$.
- Therefore, $\lim_{x \to 2} [f(x) + g(x)] = 3 + 1 = 4$.
(b) $\lim_{x \to 0} [f(x) + g(x)]$:
- $f(x)$ has a jump at 0: left limit $f(0^-) = 1$ (open circle at (0,1)), right limit $f(0^+) = 1$ (line passes through (1,1)). So $\lim_{x \to 0} f(x) = 1$.
- $g(x)$ is continuous at 0 with $g(0) = 1$.
- So, $\lim_{x \to 0} [f(x) + g(x)] = 1 + 1 = 2$.
(c) $\lim_{x \to 0^+} [f(x) + g(x)]$:
- $f(0^+) = 1$, $g(0^+) = 1$.
- Sum is $1 + 1 = 2$.
(d) $\lim_{x \to 0^-} [f(x) + g(x)]$:
- $f(0^-) = 1$, $g(0^-) = 1$.
- Sum is $1 + 1 = 2$.
(e) $\lim_{x \to 2} \frac{f(x)}{3 + g(x)}$:
- $f(2) = 3$, $g(2) = 1$.
- Denominator $3 + 1 = 4$.
- Limit is $\frac{3}{4}$.
(f) $\lim_{x \to 2} \frac{1 + g(x)}{f(x)}$:
- Numerator $1 + 1 = 2$.
- Denominator $f(2) = 3$.
- Limit is $\frac{2}{3}$.
(g) $\lim_{x \to 0^+} \sqrt{f(x)}$:
- $f(0^+) = 1$.
- Limit is $\sqrt{1} = 1$.
(h) $\lim_{x \to 0^-} \sqrt{f(x)}$:
- $f(0^-) = 1$.
- Limit is $\sqrt{1} = 1$.
(i) $\lim_{x \to -2} f(x)$:
- Left side limit $f(-2^-)$ is the open circle at ( -2, 1 ), so limit from left is 1.
- Right side limit $f(-2^+)$ is the closed dot at ( -2, -2 ), so limit from right is -2.
- Since left and right limits differ, $\lim_{x \to -2} f(x)$ does not exist.
**Final answers:**
(a) 4
(b) 2
(c) 2
(d) 2
(e) $\frac{3}{4}$
(f) $\frac{2}{3}$
(g) 1
(h) 1
(i) NA
Limits Functions 7F7F58
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