С подробным пошаговым объяснением.

1.Составьте квадратное уравнение, корни которого равны  -5 и 8

Помогите пож-та очень прошу  (хотябы 2-ое задание )

Задание №1

Раскройте скобки таким образом, чтобы предложения выражали: а) реальное условие

1. If I (to know), I (to tell) you. 2. If she (to want) to talk she (to ring up). 3. Her health (to improve) if she (to sleep) longer. 4. If he (to have) enough money, he (to buy) a large house. 5. She (to feel) lonely if Peter ( to go) out every evening. 6. We (to be) pleased to see you if you (to arrive). 7. If we (to can) come on Sunday, we (to come). 8. I (to understand) Mr. Smith if he (to speak) slowly. 9. We (not / to go) by ship unless there (to be) no other way. 10 If you (not / to give) him good meals, he (not / to be able) to work hard.

Задание №2

Замените предложения нереального условия в настоящем времени на предложения нереального условия в прошедшем времени. 1. If she tired, she could be better. 2. He would do more work if he were able. 3. I should live better if I earned more money. 4. If I knew the answer, I should tell you. 5. He wouldn't come unless you invited him. 6. We shouldn't remember it if it weren't so strange. 7. If I had time, I would help you. 8. Peter would come if you wanted him to. 10. If you wrote more often, you would receive more letters. 11. They would prefer to keep it if they could. 12. I would buy it by myself if I had money. 13. If they offered it to me for nothing, I wouldn't take it. 14. I should break a promise if I answered your question. 15. If you swore to keep a secret, I would tell you.

Скорость лодки против теч.-0,9 км/ч Собственная скор.-3,2 км/ч скорость теч-? скорость по теч.-?
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Для покупки 8 воздушных шаров у Дани не хватает 2 рубля. Если он купит 5 шаров то у него останется 10 рублей. Сколько денег было у дани.
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можно условие второй задачи и решение двух задач 

составь схему на берегу лесного ручья сидит Алёнушка и тоскует о родном братце