6 х больше или равно - 18 

1. She is a teacher.2. Her hobby is tennis.3. Her children do to school.4. She is a doctor.5. They.

1. She2. Her3. Her или His (из контекста непонятно, какого Терри пола )4. He she

6х≥ -18х≥ -3Ответ: [-3; +∞)