What is the factored form of 2x^3 + 4x^2 - x

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.