Final answer:
The inequality is J < 15 and T > 7.
Step-by-step explanation:
To write an inequality showing the difference between the number of quizzes graded by Mr. Jansen and Mr. Tong, we can use variables to represent the number of quizzes each person has graded. Let's use 'J' to represent the number of quizzes Mr. Jansen has graded and 'T' to represent the number of quizzes Mr. Tong has graded.
The inequality is J < 15 and T > 7.
This inequality states that Mr. Jansen has graded less than 15 quizzes and Mr. Tong has graded more than 7 quizzes.