Anthony correctly answered 70% of the questions, leaving 30% of the questions answered incorrectly.
To determine the percentage of questions Anthony answered incorrectly, we first need to calculate the percentage of questions he answered correctly. Since he answered 14 out of 20 questions correctly, the percentage correct can be calculated as:
Percentage correct = (Number of questions correct) / (Total number of questions) * 100
Percentage correct = (14 questions) / (20 questions) * 100
Percentage correct = 0.7 * 100
Percentage correct = 70%
To find the percentage incorrect, we simply subtract the percentage correct from 100%:
Percentage incorrect = 100% - Percentage correct
Percentage incorrect = 100% - 70%
Percentage incorrect = 30%
Therefore, Anthony answered 30% of the questions on his math quiz incorrectly.