Помогите пожалуйста 5.9x -5.21=9.54

Write questions about the underlined words.

1. They`ll go to the disco if it rains.

2. She`ll find out a lot about the subject when she reads this book.

3. She`ll lose weight when she goes on a diet.

4. If she has time, she`ll work as a babysitter.

5. You`ll burn calories if you do sports.

Найдите sin A, если cos A= корень из 2/2

Сколько решений неравенства 2x^2-5x<0 содержится среди чисел - 1,5 ; 0 ; 1; 3 ?