This is reflections and coordinates on a graph. 8th grade math. need answers for all

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2

What is the solution for the following system of equations? use any method to solve. 2x + 8y = 4 x = -3y + 5 question 4 options: x = 14, y= -3 x = 2, y = -3 x = -3, y = -3 x = 12, y = 5