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A particle moves along a straight line so that its position after seconds is given by...

A particle moves along a straight line so that its position after seconds is given by where measures the distance from the starting point in inches. On which time intervals is the particle moving in a positive direction?

Find each open interval where the function
f(x)=\dfrac{x}{x^2+1} f ( x ) = x x 2 + 1 is concave upward.

At what -value(s) does have an inflection point?

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