PLEASE HELP The four owners of a store mailed 1,840 postcards to customers. Each owner mailed the same number of postcards. Which equation can be solved to find x, the number of postcards each owner mailed?

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.