Can someone do this and somewhat explain why they are or are not functions

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

Which of the following is the maximum value of the equation y=-x^2+2x+5 a. 5 b. 6 c. 2. d. 1