confusion matrix machine learning

Briefly answer the following questions: A. In Infering Rudemintary Rules, how to deal with numeric attribute? B. In Divide and Conqure, explain why is it a problem to have an attribute with many nominal values, and how to cope with it? C. Using this confusing matrix Predicted Class Positive Negative Positive 60 120 Actual Class 140 180 Negative Calculate the following (write the formula): . Precision = . Specificity =