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Solve each of the following inequalities. Express the solutions algebraically and on a number line.  


    Solve the equation for . Plot the boundary point on a number line. Test a point on each side of the boundary point. Shade the region that makes the inequality true.

    Shaded on number line, from closed point on 4, to the left.


    See part (a). This inequality is quadratic, so look for two boundary points.


    Shaded on number line, from opened point on negative 6, to the left, and from opened point on 6, to the right.