Can someone please help a sister out

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

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 equation of a line that passes through points (0, 4) and (-4,-8)?