A) \[\left( 12.5,\infty \right)\]
B) for all real numbers
C) for all positive real numbers
D) (0, 12.5)
Correct Answer: D
Solution :
For strictly Incurasing \[P'\left( x \right)>0\Rightarrow -10x+125>0\] \[\Rightarrow -10\left( x-12\,.\,5 \right)>0\] \[\Rightarrow x-12\,.\,5<0\]
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