Help maybe so I can get a good grade?

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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