Найдите сумму всех натуральных чисел, кратных 4 и не превышающих 150 

1)написать молекулярные и ионные уравнения реакций между раствором азотной кислоты и карбонатом калия 2)составте уравнение реакции концентрированной азотной кислоты с медью.укажите степени окисления элементов и расставте коэфициенты с помощью метода электронного баланса

Лошадь съедает воз сена за месяц,коза за два,овца за три.За какое время они вместе съедят один воз сена.

Помогите, пожалуйста!!! Нужно найти ошибки в предложениях и исправить их.

The parents wanted to know if religious education was compulsory at that school.

Some students couldn't remember ehat home task had they got yesterday.

The daughter asked his father if college of further education gave him good preparation for the future profession.

The parents wanted to know if the price for studying at the boarding school was high.

Pupils wanted to know how much time they would spend on the excursion.

The girl wanted to know did her mother like going to school.

The teather asked had the students already read the text.

The mother asked what mark had her son got for the test last week.

She asked him if he was ready with his homework.

Mark asked his friend what university he will enter next year.