There are 82 books 23 books i read how many books are left

What is the equation of the graph below? y=sec(x)-4

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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.