Question: Need help solving this equation. D. Section 4.4 Systems of inequalities will be used to model three of the target heart rate ranges shown in

Need help solving this equation.

D. Section 4.4 Systems of inequalities will be used to model three of the target heart rate ranges shown in the bar graph We begin with the target heart rate range for cardiovascular conditioning, modeled by the following system of inequalities: 10 S a $ 70 H 2 0.7(220 - a) H S .8(220 - a) Heart rate ranges apply to Target heart rate range is greater and less than or equal to 80% of ages 10 through 70, than or equal to 70% of maximum heart rate. inclusive. maximum heart rate. The graph of this system is shown in the figure. Use the graph to solve the following Exercise. Target Heart Rate Range for " Cardiovascular Conditioning 180 a - 10 170 160 H = 0.8(220 - a) Heart Rate (beats per minute # = 70 H = 0.7(220 - a) 100 10 20 30 40 50 60 70 80 90 Age a. What are the coordinates of point B and what does this mean in terms of age and heart rate? b. Show that point B is a solution of the system of inequalities

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