Во сколько раз минутная стрелка движется быстрее, чем часовая?

Change the following sentences into passive. 1)The theatre fascinated Alexander 2)Somebody made this table from mahogany, a popular wood in the 19th century. 3)MILLIONS OF PEOPLE WATCH THIS POPULAR PROGRAMME. 4)Somebody will meet you at the airport. 5)They have closed the metro station . 6)They are building a new road.

PO4+Fe(OH)2=
PO4+Cuo=
PO4+NaNO3=
PO4+K2SO4=
PO4+Ca=

  Выберите правильную видо-временную форму глагола и переведите полученные предложения, Заранее спасибо!

1)He (to change)the oil before they started to work.

a)     was changing

b)    had changed

c)     changed

d)    had been changing

2). Recently some new types of farm machinery (to design) . 

a)     has designed

b)    have designed

c)     have been designed

d)    designed

3). Agricultural machinery production in recent years (to be) impressive.

a)     is

b)    was

c)     will be

d)    has been

4. Yesterday I (to repair) this seed drill all day long. 

a) am repairing

b) repaired

c) was repairing

d) will repair

5). I can’t help you right now, I (to check) the hydraulic system pressure. 

a) am checking

b) checked

c) have checked

d) check

как найти b1 и q если дано bn=5/2 в n степени