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Являются ли векторы а(1;-1;2) и в (-1;-2;1) перпендикулярными?

Даны точки А(3;-2;1), В(4;0;-8), С(-5;4;-2), Д(-4;6;-11). Среди векторов АВ, ВС, ВД и АД найти равные.

Complete the sentences. Use the correct form of the verb in brackets.

1   I remember ________ (play) on the beach when I was about three years old.

2   If the exam had been last week, I’m sure I  ________ (not pass) it.

3   Catherine apologized to me for ________ (be) so moody all week.

4   Neil wishes he ________ (speak) better French. His company are going to send him to Paris.

5   The girl denied ________ (take) my mobile phone.

6   She ________ (not meet) Paul if I hadn’t introduced them.

7   I wish I ________ (not put) on these shoes today. They’re really uncomfortable.

8   I’m really sorry – I forgot ________ (post) the letter you gave me.

9   If I ________ (be) you, I wouldn’t drive that old car.

10   Rebecca convinced me ________ (not go) to the cinema with Harry.