Дописать уравнения,определить тип реакции и проставить коэффицент.
KMnO4=K2MnO4+MnO2+O2
NH3=
H2O2=H2O+O2
NaHCo3=Na2CO3=Na2Co3+CO2+H2O
CH4=
Зарание спасибо:)

решите пожалуйста задачу высота правильной четырёхугольной пирамиды равна 12 см . периметр основания пирамиды -40 см -её апофема -13 см найдите площадь полной поверхности и объем пирамиды?

wto takoye imya suwestvitelniye

Алгебру не понимаю вообще.
Решите, пожалуйста. Если надо больше пишите в л.с., договоримся. 

Work in pairs . Take turns to ask and answer the questions to the text. Предложения: 1.What did she do in the morning ? 2.Did she have an English lesson yesterday ? 3.What did the children do at the English lesson ? 4.Did her mum buy her a new dress or a new dress or a blouse? 5.Did ____________ ? 6.Did _______or ________? 7.Was__________? Текст: 1.Ukrainian was my first lesson.We read a very interesting story.I answered the teacher's questions well.Miss Alison gave me a very good mark. 2.In the afternoon we went shopping with my mum . She bought me a new dress and a pair of shoes . I was really happy . 3.The english lesson was very interesting . We wrote a story , did grammar exercises , played games and sang songs. 4.I had a very nice day yesterday. At 8 o'clock I took my bag , put on my clothes and went to school . I gor to school by bus . I didn't wait long at the bus stop . The weather was nice.