## Elementary Algebra

The solution set is {x|x $\geq$ 3} , or [3, $\infty$) in interval notation.
We use the properties of inequalities to solve this inequality. x $\geq$ 2.1 + 0.3x x - 0.3x $\geq$ 2.1 0.7x $\geq$ 2.1 Divide both sides by 0.7 to obtain: x $\geq$ 3 The solution set is {x|x $\geq$ 3} , or [3, $\infty$) in interval notation.