solve on paper please

The table below provides the covariance matrix for the returns of three stocks: Stock A, Stock B, and Stock C. Two portfolios are created from the three stocks as follows: Portfolio X is created by investing equally in Stock A and Stock B, and Portfolio Y is created by investing equally in Stock A and Stock C. Find the covariance between the returns of the two portfolios. Stock A Stock B Stock c Stock A 0.25 0.05 -0.114 Stock B 0.05 0.09 0.03 Stock C -0.14 003 0.36