измерения прямоугольного параллелепипеда равны 43см,26см ,52см. найдите 1)сумму длин всех его ребер.2)площадь поверхности параллелепипеда.

на двух полках стояло 210 книг. Если с первой полки убрать половину книг, а на второй увеличить их число вдвое, то на двух полках будет 180 книг. Сколько книг стояло на каждой полке первоначально?

Сколько решений неравенства 3x^2-5x-12>0 содержиться среди чисел -3,5; -2; 4; 5.

• ∆АВС вписан в окружность. ̮ АВ: ̮ ВС=11:12. Найдите ÐВСА, ÐВАС, если ÐАОС=130˚.

Правильно употребить глаголы в Past Simple, Past countinuous, Past Perfect
1. Kate ( to go) to the airport with her parents and her brother Nick. While they (to wait) at the airport, Nick (to remember) that he (to have) something important to tell Kate. Her friend (to phone) just as they (to leave) to ask at what time Kates flight (to leave). Previously Kates friend (to think) that she wouldnt be all to get to the airport in time but she (to turn) up while Kate (to say) goodbye to herr parents. she finally (to go) through passport control and everybody (to wake) goodbye.
2. It (to be) the day of this English exam. He (to wake) up and (to look) at this alarm clock. He (to see) that it (to stop) raining during the night. He (to realise) he would be late for his exam. He (to be) an hour late and exam already (to begin). When he (to sit) at the table, he (to find) that he (to leave) his pen at home. He ( to ask) his friend his friend to give him a pen. Despite everything (to go) wrong he (to pass) him exam.