Знайдіть значення виразу (2√5 - √3)(√3+2√5)

Помогите пожалуйста,люди добрые.

Complete the sentences with the correct form of the verbs in brackets.

1)   I’m afraid he _______ (do) his homework at the moment. Phone again at about 6.30 p.m.

2)   Why _______ (they arrive) late for every lesson?

3)   Miss Barnes _______ (teach) us this term. She’s got a different class.

4)   My cousin _______ (have to) wear a uniform at his school. He wears what he wants.

5)   _______ (you go) to Germany for your holiday every year?

6)   We _______ (go) for a walk in the forest. Do you want to come?

7)   I _______ (go) out with my friends on Friday nights.

8)   Where ______ (they have) the chess club on Mondays?

9)   _______ (he have to) walk to school every day?

10) There _______ (be) some socks on the floor.

диагонали ромба равны 14 см и 48 см. Вычислите периметр ромба. С пояснением пожалуйста.

Установите соответствие между схемой химической реакции и веществом- восстановителем в ней. СХЕМА РЕАКЦИИ ВОССТАНОВИТЕЛЬ А) HCl + MnO2 → MnCl2 + Cl2 + H2O 1) MnO2 4) H2S Б) H2S + HClO3 → HCl + S + H2O 2) HCl 5) Al В) HCl + Al → AlCl3 + H2 3) HClO3

составьте рассказ о какой-либо профессии