Что может быть официальным ??? СРОЧНО !!! ( 4 слова )

В треугольник со сторонами 5 см,6 см, 6 см вписана окружность.Найдите радиус этой окружности.

помогите пожайлуста:

Напишите предложения в пассивном.

1 Our car / service / a mechanic / at the moment.

2 A mam / shoot / an air gun / outside the petrol station last night.

3 Gunpowder / invent / the Chinese.

4 At the surgery yesterday, I / examine / Dr Peterson / and I / give / a prescription.

5 I went to see it because I / tell / it was a good film / all my friends.

6 This photograph / my grandfather.

7 It looked like the window / break / a hammer / some time before.

8 Our dog / give / an injection / a special syringe / the vet.

9 The winning goal in last night's match / score / Donatello / a brilliant free kick.

10 Your cheque / send / last Friday and / should / deliver / to you tomorrow.

Найдите наибольшее значение функции y=-2x^2+5x-3