Write the partial fraction decomposition of the rational expression. Check your result algebraically. 7 *2+x-12 Approximate the logarithm using the properties of logarithms, given logo 20.3562, logo 3 0.5646, and logo 50.8271. (Round your answer to four decimal places.) logo 50 I Use matrices to solve the system of equations (if possible). Use Gaussian elimination with back-substitution. (If there is no solution, enter NO SOLUTION. If there are infinitely many solutions, express x, y, and z in terms of the real number a.) x+2y-2z = -27 4y + 2z => O -x+y-2=-6 (x, y, z) =