[MA2019] (6) 20 :
20. Write and solve inequalities in the form of x>c, x<c, x≥c, or x≤c to represent a constraint or condition in a real-world or mathematical problem.
a. Interpret the solution of an inequality in the context of a problem.
b. Represent the solutions of inequalities on a number line and explain that the solution set may contain infinitely many solutions.