9 to the second power multiply by 3 to the 6 power =3 to the ? power

A(t)=728(1+0.04)^t how much money did aditya originally invest

Can any one me with the answers to these questions asap?

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%