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It would be helpful to know what the decision is to know what the benefits and opportunity of the decision are. It is important to include this information.
x2 = 16take the root square for both sides the result will be :X = +4 or -4
It is the result that you think will happen as the outcome of an experiment. It is the same as the "expected result", which is usually denoted as E(x)=xp(x).
Given an inequality, you need to decide whether you are required to shade the region in it is TRUE or FALSE. If you are given several inequalities, you would usually be required to shade the regions where they are false because shading is additive [shading + shading = shading] and you will be left with the unshaded region where all the inequalities are true.Next, select any point which is not of the line or curve for the inequality. Plug its coordinates into the inequality: it the result FALSE? If so, shade the region (relative to the line or curve) in which the point is found. If substituting the coordinates gives an inequality which is TRUE then shade the regions which is the other side of the line or curve.
You replace the variable by the number, do all specified calculations, and then check whether the resulting inequality is true or false. This is basically not very different from checking a solution of an equation.