Answer Happy

please answer q 8-10
QUESTION 8 The relation between the weight matrix P and the cofactor matrix Q is defined by: P=0-1 P+Q=1 (I denotes the identity matrix) O such relation is not defined O none of above is true QUESTION 9 If the covariances between measurements are unknown, the variance covariance matrix of the measurements is normally simplified into: O non-diagonal matrix identity matrix diagonal matrix covariance matrix QUESTION 10 If the variances of measurements are unknown, the variance-covariance matrix is normally simplified into: variance matrix identity matrix O diagonal matrix covariance matrix