Собака гонится за лисицей.Прыжок собаки 2 м. а лисицы 1м.Пока собака делает 2 прыжка, лисица делает 3 прыжка.Сможет ли собака догнать лису?

((2/4/7 - 1/2/3) + 5/21) * х = 8.

Это дроби.

2/4/7 и 1/2/3 - с целыми. 2 целых 4/7 и 1 целая 2/3.

найдите корни уравнения 25x^2-1=0

нужно вставить по смыслу:

have to, don't have to, can или  can't.

______________________________________________________________

1)___ you ___ (wear) school uniform at your school or your school or is it optional?

2) ___ you ___ (get married) when  you are 16 years old in our country?

3) Sue ___ (get up) early during the week because she doesn't  work in the morning.

4) They ____ (wash) the dishes and help prepare the food.
6) They ___ (serve) the customers because they aren't waiters.
7) You____ (go) driving on your own, it's too dangerous.

8) You___(have) a partner.

9) You ___(leave) now if you want.

10) You ____(stay) until 5 o'clock, it's not necessary.

11) " ___ Monica ____ (use) a computer in her new job? "

Помогите пожалуйста, очень срочно нужно!!! буду очень благодарна!!!