What is the value of a?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Ithink i know it but i want to be sure so can you me out ?

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.