1.

What is the mathematical expression for a function to be strictly decreasing on (a,b)?

A. x<sub>1</sub> = x<sub>2</sub> f(x<sub>1</sub>) f(x<sub>2</sub>) x<sub>1</sub>, x<sub>2</sub> (a,b)
B. x<sub>1</sub> &lt; x<sub>2</sub> f(x<sub>1</sub>) &gt; f(x<sub>2</sub>) x<sub>1</sub>, x<sub>2</sub> (a,b)
C. x<sub>1</sub> &lt; x<sub>2</sub> f(x<sub>1</sub>) &lt; f(x<sub>2</sub>) x<sub>1</sub>, x<sub>2</sub> (a,b)
D. x<sub>1</sub> &lt; x<sub>2</sub> f(x<sub>1</sub>) = f(x<sub>2</sub>) x<sub>1</sub>, x<sub>2</sub> (a,b)
Answer» C. x<sub>1</sub> &lt; x<sub>2</sub> f(x<sub>1</sub>) &lt; f(x<sub>2</sub>) x<sub>1</sub>, x<sub>2</sub> (a,b)


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