Intervals where a cubic polynomial increases or decreases

1. A.
   $0 < x < 1$
2. B.
   $-1 < x < 1$
3. C.
   $x < -1$ or $x > 1$
4. D.
   $-1 < x < -\frac{1}{2}$

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1. A.
   $(3,\infty)$
2. B.
   $(1,3)$
3. C.
   $[3,\infty)$
4. D.
   $[0,3]$

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1. A.
   $f(x)$ is decreasing in $(-\infty,10]$ and increasing in $[10,\infty)$
2. B.
   $f(x)$ is increasing in $(-\infty,10]$ and decreasing in $[10,\infty)$
3. C.
   $f(x)$ is increasing throughout real line
4. D.
   $f(x)$ is decreasing throughout real line

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1. A.
   $1 < x < 2$
2. B.
   $x < 1$ or $x > 2$
3. C.
   $x < -1$ or $x > -2$
4. D.
   $-2 < x < -1$

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1. A.
   $(-\infty,-6) \cup (2,\infty)$
2. B.
   $(-6,2)$
3. C.
   $(-\infty,-2) \cup (6,\infty)$
4. D.
   $(-6,2]$

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