0.345 natural whole integer rational irrational real

Which is an equation for the nth terms of the sequence 12,15,18,21

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.

Hurry can a triangle can be constructed with angles measuring 115°,55°, and 20°? yes or no