Между какими парами веществ возможна химическая реакция? Напишите молекулярные и сокращённые ионные уравнения реакций,учитывая,что растворимые и малорастворимые вещества взяты в виде растворов. 1) Карбонат кальция и азотная кислота. 2)Гидроксид калия и сульфат натрия. 3)Нитрат свинца(2) и хлорид меди(2). 4)Фосфорная кислота и сульфат калия. 5)Гидроксид железа(3) и серная кислота.

На изготовление 416  деталей первый рабочий затрачивает на 10 часов меньше, чем второй рабочий на изготовление 546 таких же деталей. Известно, что первый рабочий за час делает на 5 деталь больше, чем вторпой.Сколько деталей в час делает первый рабочий?

(Решение задач с помощью квадратных уровнений)

Буду очень благодарна!

помогите составить пересказ: One day, Zarena was out searching for food. She was running through some high grass when she heard a noise. She stopped. ‘What was that?’ she whispered to herself. Then she heard it again. Very carefully and quietly, Zarena went to investigate.Zarena soon discovered what was making the noise. It was Vantura, who was in serious trouble. There was an old rusty tin can stuck on her head.She couldn’t get it off, and was starting to panic. The noise Zarena had heard was a combination of Vantura shouting ‘Help!’ and her banging the can against the ground in attempt to remove it from her head. Zarena didn’t know what to do. ‘Vantura doesn’t know I’m here, so I could just leave quietly,’ she thought to herself.No, maybe I don’t like Vantura, but I still have to help her.’
Zarena went over to Vantura. ‘Vantura, it’s me – Zarena. Don’t worry, I’ll help you. Just keep still.’ Zarena tried to pull the can off Vantura’s head, but it wouldn’t move. ‘Oh dear,’ said Zarena. ‘It’s on very tight. I can’t pull it off. But don’t worry, Vantura, I won’t leave you. There must be a way to help you.’ нужно сегодня желательно на английском языке. ПОЖАЛУЙСТА!!!

Помогите пожалуйста. Корень шестой степени из (2х-7)^6 - корень шестой степени из (2х+7)^6 если X<3

перессказ текста:One day, Zarena was out searching for food. She was running through some high grass when she heard a noise. She stopped. ‘What was that?’ she whispered to herself. Then she heard it again. Very carefully and quietly, Zarena went to investigate.Zarena soon discovered what was making the noise. It was Vantura, who was in serious trouble. There was an old rusty tin can stuck on her head. She couldn’t get it off, and was starting to panic. The noise Zarena had heard was a combination of Vantura shouting ‘Help!’ and her banging the can against the ground in attempt to remove it from her head. Zarena didn’t know what to do. ‘Vantura doesn’t know I’m here, so I could just leave quietly,’ she thought to herself.‘No, maybe I don’t like Vantura, but I still have to help her.’
Zarena went over to Vantura. ‘Vantura, it’s me – Zarena. Don’t worry, I’ll help you. Just keep still.’ Zarena tried to pull the can off Vantura’s head, but it wouldn’t move. ‘Oh dear,’ said Zarena. ‘It’s on very tight. I can’t pull it off. But don’t worry, Vantura, I won’t leave you. There must be a way to help you.’Zarena thought carefully. ‘What should I do?’ she said to herself. Then she had an idea.
‘Vantura,’ said Zarena, ‘I’m going to try to cut the can with my teeth. It’s the only way to get you out.’ Zarena managed to get a piece of the top end of the can between her teeth. It tasted horrible, but she started to chew. Fifteen minutes later, Vantura was free.
They both lay breathless on the grass. ‘Thank you,’ said Vantura eventually. ‘I’ll never forget this.’