Which of the following must be true for an estimator of a population parameter to be
unbiased?

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

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 difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers