T. O.D.: Marcia has just finished her first week working at a local coffee shop! Before Marcia started working at this shop she never drank caffeinated beverages except for soda. Marcia noticed that when she drinks the coffee drinks she feels like her heart rate increases as if she was doing some sort of exercise but when she drinks her favorite soda she doesn't feel this way. Marcia thinks that there must be more caffeine in 8oz. of coffee than there is in 8oz. of her favorite soda. Marcia decides to set up a mini experiment. Marcia decides that before she starts her shift at work, she records her heart rate by taking her pulse of 1 minute. Her resting heart rate is 90 beats per minute. Then, she drinks 1 soda and takes her pulse 10 minutes after she finished her drink and records 96 beats per minute. The next day, Marcia takes her pulse before her shift and records 90 beats per minute and then drinks a cup of coffee, waits 10 minutes and records her pulse rate as 116 beats per minute. What is the

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