So, if the original price of any item is x, then increase for markup is 10% of x i.e. . Hence, the expression that represents the new price with the markup is (x + 0.1x) = 1.1x.
The critical values for x are -2 and -6. We break the function domain into regions: -∞ to -6 f(x) ≥ 0 -6 to-2 f(x) < 0 this is the correct statement, answer 2 -2 to +∞ f(x) ≥ 0