найти сумму чисел: -1+2-3+4-...-99+100

Выберите правильное About a week (1)before /in the end I went to Peter's birthday party I bought him a present. I got to the party early but (2) later/as soon as I arrived I gave him the present and he liked it. Then some more people came and the party started. (3) First/Suddenly we had a drink. (4) Next/During we had tea. (5) After that/Dun'ng tea I talked to Sue but (6) before/as soon as we started talking her mother phoned. There was an emergency at home and she went home. But she came back (7) later/as soon as. It was a summer evening and we went outside. (8) First/Suddenly the moon came out and we all looked at the moonlight in the garden. (9) After that/During we went back in again. We played some music, talked and danced. (10) Suddenly/In the end we all went home. It was a good party.

в ромбе mpkt на сторонах отмечены четыре точки делящие стороны в отношении 2:3 считая от вершин m и K докажите что отмеченные точки являются вершинами прямоугольника

желательно бы решение на фото.

в нем самую яркую звезду называли собачкой. Вопрос: В нем и самую какие часть речи

Напишіть назви оксидів навпроти формули кожного з них: а) N2O3 б)ZnO в)CrO3 букви там маленькі і знизу стоять в а і в, просто не змогла так написати, допоможіть будь-ласочка!