Седьмой член арифметической прогрессии составляет 70% от четвертого, а сумма седьмого и четвертого членов равна 102
найдите разность этой прогрессии.
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ээто

1does he? 2does

mr adams doesn'n work on monday, does he?

  mr adams works on tuesday, doesn't he?

to be afraid ,to be hungry,to be busy,to be tired,to be cheerful,to quiet,to be kind,to be lucky

  to   go for a walk,to sit ,to stand,to read,to run ,to jump,to see , to drink,to write ,to think,

1. the boys are playing football now. they are tired. they have been playing football an hour and a half.

2) tom began talking on the phone an hour ago. i think he should finish. he has been talking on the phone for more than an hour already.

3) roy came to see  the dentist at nine o`clock. it is 9: 30 now.

roy has been waiting for the doctor since 9: 00 a.m.

4) colin became a professor in 1998. he has been working at the university since he became a professor.

5) the greens went to canada last summer. they are living in canada now. they have been living in canada for about a year.