1. The problem statement, all variables and given/known data J represents a 3x2 matrix and H represents and 2x4 matrix. y = Hx and z = Jy, where y is a 2x1 matrix, z is a 3x1 matrix, and x is a 4x1 matrix. Form the composition J○H and simplify z = J○Hx. 3. The attempt at a solution I don't know what my answer is going to look like because I don't know what a composition of matrices represents. Is it the same as matrix multiplication?