Решите уравнение 2х-корень из х - 3=0

ВОРОБЕЙ ЗА ДЕНЬ СЪЕДАЕТ 18 ГРАММ ПИЩИ ЭТО СОСТАВЛЯЕТ ТРЕТЬ МАССУ ЕГО ТЕЛА . СКОЛЬКО ВЕСИТ ВОРОБЕЙ ?
ЛАСТОЧКА СЪЕДАЕТ ЗА ДЕНЬ В 7 РАЗ БОЛЬШЕ ЧЕМ ВОРОБЕЙ .МАССА ЛАСТОЧКИ СОСТАВЛЯЕТ ТРЕТЬ ТОГО ЧТО СЪЕДАЕТ ЗА ДЕНЬ .СКОЛЬКО ВЕСИТ ЛАСТОЧКА ?
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2. a) Read some letters to the Problem Page. What advice can you give those people? Dear Jellybean, I have a major bad habit. Ever since I was in grade 2 (and I'm now in grade 9) I've had a problem with lying. I always lie to my friends, family, strangers... everyone. And I really don't know why! I don’t have a popularity problem, so it’s not like I’m doing it to fit in. But my friends have brought it up and I still deny it. I don't want to be known as a liar. I would really like to stop. Please help melt! Kris Dear Jellybean, I need help with my parents. I recently became a vegetarian and at the beginning they said it was great. Now that I'm really not eating meat, they don't let me be one anymore. They are constantly telling me you need to eat meat. And I always say no, and they tell me if I don't, they aren't going to buy me what I need for school like backpack, uniform, etc. I'm so mad right now! They said if I want to be one, I have to be one at 18. I really don't know why. I eat a lot of veggies and breads. I eat basically everything including dairy products, except meat. How do I convince them? Cathy