1-Apply the first derivative test to find the intervals on which f ( x )= x*22 x+1 / x+1 is increasing and/or decreasing.

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2- - The position equation for the movement of a particle is given by y=( x 21) 3 when y is measured in feet and x is measured in seconds. (10 points) a) Find the velocity at 3 seconds. b) Find the acceleration when x=4seconds.