What is the product of the roots of the equation x^3-4x^2+x+6=0?

Can someone pls ! pls answer all. no explanation needed..

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 slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?