Now that you have Anne's total lung area and the total amount of dead air, you can calculate what percent of Anne's lung capacity is dead air.

You'll use the following formula, in which UDA is the amount of dead air in the upper slice, LDA is dead air in the lower slice, UTA is total lung area in the upper slice, and LTA is total lung area for the lower slice.
Dead air formula
To be diagnosed with emphysema, a person has to have more than 15 percent dead air in their lungs. According to your calculations, does Anne have emphysema?
Since the amount of percentage of dead air in Anne's lungs is 10%, Anne can go home happy, knowing that she does not have emphysema.
Anne now knows the reason behind her coughing and shortness of breath; since she's unable to expel 16% of the air in her lungs, she is quite likely to have emphysema.