For this case we have the following inequality: From here, we must clear the value of x. We have then: Therefore, the solution set is all the numbers belonging to the following interval: (2.9,∞) Note: see attached image for graphic solution. Answer: The numbers that belong to the solution of the inequality are those that are shown in the attached graph and that belong to the interval: (2.9,∞)
Since we know the ratio is going to stay constant at , we can use this to find the height of the lamp along with the information that the total distance from the lamp to the tip of his shadow is 20: