1. The problem statement, all variables and given/known data A is an mxn matrix and C is a 1xm matrix. Prove that CA=Sum of (C sub j)*(A sub j) from j=1 to m. Where A sub j is the jth row of A Sorry for the messy problem statement, I couldn't figure out the summation notation on here. 2. Relevant equations 3. The attempt at a solution I set (C sub j)*(A sub j)=D sub j I then tried to manipulate it towards something, but I made no progress, thanks for any help you can give.