Вычислите массу цинка, который следует растворить в избытке соляной кислоты, чтобы получить 56л (н.у.) водорода.

Пассажир поезда, идущего со скоростью 40 км/с, видит в течение 3 с встречный поезд длиной 75 м. Скорость встречного поезда

В прямоугольном треугольнике АВС(угол С 90 градусов)АВ =10 см,угол А =альфа,найдите АС. Прошу решите умоляю.

Прочитайте 2 текста и запишите к ним вопросы, используя оборот  

there + to be.

Example:   Is there a pool near the house? -  Are there two doors and her car?  
 
Donna Walton
 
Donna’s an English teacher. She’s not rich and she’s not famous. Her house is small and there’s no pool. There are three bedrooms in the house. Donna’s car is old. It’s slow and uncomfortable. There’s no radio or cassette player in her car. There’s an engine, a steering wheel, and there are four wheels and two doors. Donna isn’t happy. She’d like a big house, a new car and a lot of money.
 
Zack Zebedee.
 
Here is a rock star. He’s very rich and famous. His house is large and there’s a swimming pool in the backyard. There are ten bedrooms in the house. Zack’s car is new. It’s fast and comfortable. In his car there is a climate control system, a CD player, a VCR, a phone and fax machine. But Zack is not happy. He’d like a small house, a small car and a family with two kids.

Решите пожалуйста!!!Два уравнения!!Я не догоняю!!

1) 14х - 2х+9х-х-5х = 40

2) (2 целых 2/5х+6 целых 1/2) : 1 целую 4/7 - 2 целых 4/9 = 4 целых 5/9

Решите плииииииз!!!!!!!буду оч благодарна!!!!