стрела, выпущенная из лука вертикально вверх, упала на землю через время t=6 с. на какую максимальную высоту поднялась стрела?

ответ: 45 м

На 5 тарелках лежало 35 пирожных , а на 4 блюдах 36 пирожных. На сколько больше пирожных на блюде , чем на тарелке?

на рисунке изображен график функции у=х"2-4. Какие из данных прямых не имеют с графиком этой функции ни одной общей точки? х=3, у=-4, у=-10, у=-х, у=х-5

помогите пожалуйста глаголы в скобках поставить в правильное время: Past Simple or Past Continuous

 When the door-bell (ring) he (stand) up and (go) to the door.
 It (rain) hard this morning when I (wake up).
 While I (have) breakfast this morning, my sister (phone) from Mexico.
 When I (see) his face, I (realize) my mistake.
 Yesterday morning he (wake up) late and (miss) his breakfast.
 When he (work) in the garden he (hurt) his knee.
 Linda (wait) for the bus when I (see) her.
 I (look) out of the window and (see) that it (snow) hard. 10. When the parents (come) from the theatre yesterday
evening, the children (sleep). \ 
 When the guests (arrive) Mrs Black still (cook) dinner.
 Tom (not/want) to lend us the money at first but then he (agree).
 The illness (get) worse and worse. In the end he (go) into hospital for an operation.
 I (walk) along the road yesterday when I (meet) an old friend. She (go) to the post-office.
 We (see) an accident when we (wait) for the bus.
 I (go) to sleep at 3 o'clock this morning and (wake) up an hour later at 4 o'clock.
 He (give) up his job as a journalist and (become) a teacher.
 While we (be) on holiday, we (spend) most of our time swimming and sailing.
 When my car (break) down 1 (phone) a garage.
 Ann (show) me a photograph and then (go) to the kitchen for some drinks.

Здание имеет 4 стены. На каждой стене висят по 3 флага на одинаковом расстоянии друг от друга. Сколько флагов на здании.