Absolute Extrema G
1. **Problem Statement:**
We have a function $g$ defined on the interval $-11 \leq x \leq 7$ by
$$g(x) = 8 + \int_{-11}^x f(t) \, dt,$$
where $f$ is a given function with areas under the curve labeled $A, B, C, D, E$ corresponding to intervals $[-11,-9], [-9,-5], [-5,-1], [1,5], [5,7]$ respectively.
The areas are given as:
- $A = 2$
- $B = 14$
- $C = 10$
- $D = 27$
- $E = 4$
We are asked to find the absolute minimum and maximum values of $g$ on $[-11,7]$ and justify the answer.
2. **Formula and Important Rules:**
The function $g(x)$ is defined as an integral of $f$ from $-11$ to $x$ plus 8.
By the Fundamental Theorem of Calculus, the derivative is:
$$g'(x) = f(x).$$
The value of $g(x)$ can be found by adding the signed area under $f$ from $-11$ to $x$ to the initial value 8.
3. **Step-by-step Solution:**
- At $x = -11$,
$$g(-11) = 8 + \int_{-11}^{-11} f(t) dt = 8 + 0 = 8.$$
- Moving from $-11$ to $-9$, the area $A = 2$ is added:
$$g(-9) = 8 + 2 = 10.$$
- From $-9$ to $-5$, area $B = 14$ is added:
$$g(-5) = 10 + 14 = 24.$$
- From $-5$ to $-1$, area $C = 10$ is added:
$$g(-1) = 24 + 10 = 34.$$
- Note the gap from $-1$ to $1$ is not mentioned, so assume no area or zero contribution.
- From $1$ to $5$, area $D = 27$ is added:
$$g(5) = 34 + 27 = 61.$$
- From $5$ to $7$, area $E = 4$ is added:
$$g(7) = 61 + 4 = 65.$$
4. **Finding Absolute Minimum and Maximum:**
- The values of $g$ at the key points are:
- $g(-11) = 8$
- $g(-9) = 10$
- $g(-5) = 24$
- $g(-1) = 34$
- $g(5) = 61$
- $g(7) = 65$
- Since $g$ is continuous and increasing by positive areas, the minimum value is at the start $x = -11$ with $g(-11) = 8$.
- The maximum value is at the end $x = 7$ with $g(7) = 65$.
5. **Justification:**
- Because $g'(x) = f(x)$ and the areas are positive, $g$ is increasing on the intervals where $f$ is positive.
- No negative areas are given, so $g$ does not decrease.
- Therefore, the absolute minimum is at the left endpoint and the absolute maximum at the right endpoint.
**Final answer:**
- Absolute minimum value of $g$ is $8$ at $x = -11$.
- Absolute maximum value of $g$ is $65$ at $x = 7$.