Nth term of 19, 16, ? , ? , 7,

Which of the following is true for the relation f(x)=2x^2+1

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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%