The cofactor matrix of the adjusted coordinates (x, y) of a point is given as follows, and the variance factor of unit weight is 0.8: Qx = 0 05 0 004 0 004 0 06 a) Compute the weight matrix of the coordinates and give the weights of the coordinates x and y. b) Compute the variance-covariance matrix of the coordinates and give the standard deviations of the coordinates x and y weights of the coordinates x and y. b) Compute the variance-covariance matrix of the coordinates and give the standard deviations of the coordinates x and y