Anew technology company is marketing drones for residential use. the bar graph shows the relation between number of sales and three types of marketing strategies over the company’s first five months of operation. what are the two biggest advantages of using a bar graph to display this kind of data?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.