Danny walks his dog for 40 minutes a day. Later that same day, he walks his dog for 15 minutes. How many days does it take Danny to walk his dog for 1650 minutes?

Wow this question is so hard omg omg omg please help NOW!

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%

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Standard deviation of 19,29,21,22,23