У пирамиды n граней. Сколько у неё ребер? Нужна формула. Заранее спасибо

помогите придумать сочинение на тему мамин день !!!плиз для 4 класса

Срочно у меня экзамен пож-та ПОМОГИТЕ ...!!!! Complete the story with the past continuons or simple past form of the verbs in parentheses ..... On February 26.1993 a bomb____(explode) in New York City's World Trade Center.At the time,55,000 people ___(work)in the Twin Towers,and thousands of thers ___(visit)the 110-storey-world-famous tourist attraction. The explosion ,which ___(take place) a little after noon,____(kill)six people and ___(injure)more than a thousand others.It ___(take) all day and half the night to get everyone out of the building. When the bomb (explode),the lights ___(go out),the elevators ___(stop),and fires ____(start).Many people were in the wrong place at the wrong time . Four co-workers____(eat)lunch in their offices when the explosion ___(shake) the Twin Towers.When the blast___ (occur) the building's walls ____(crumble)and the ceilings ___(collapse).Rescue workers ____(arrive)within fifteen minutes and ____(find)the workers dead .One man ___(walk)in the garage beneath the World Trade Center when the bomb___ (go off).He____(have) a heart attack while rescue workers (carry)him to the ambulance.Sixty schoolchildren were luckier . They ___(ride)the huge elevators when the lights ___(go out ) and the elevators ___(stop).The children and their teachers___ (have to) stand in the hot dark space as they waited for help.Six hours later ,when the elevator___(reach)the ground floor ,the school bus driver ___(wait)for them.He ____(drive) the children home to their worried families . How did the children feel while all this (happen)? "We were scared," they answered.This is one class trip they will never forget

Площадь участка,занятого пшеницей , 1200 м квадратных.С каждых 100 м квадратных этого участка собрали по 48 кг. зерна.Сколько килограммов зерна собрали со всего этого участка?