Помогите решить уравнение 10х^(0,5)*20^(0,5)=100

I have overslept this morning as usual and got to school late. It's the great problem for me to get up early; especially when my Mum has already gone out. How can I be more punctual? Have you got the same problem? Is it a strict discipline at your school? Can you enter the classroom after the bell? C1.Нужно написать письмо другу. Robert его звать.. помогите пожалуйста

Как вы думаете добрыми людьми могут быть только христиане?

1.If you_____________ (phone) me earlier, we could have bought this book.

2.I can’t stand Mr. Brown! He__________________(always / tell a lie).

3.Steven______________(work) at this problem for three months. We’ll be able to see the presentation next week.

4.We________________(just / buy) a new car.  We can go to the see.

5.Before Olga came to London, she___________________(learn) English for three years.

6.When her mother came home, Helen____________________(clean) the room since morning.

7.Thank you for_______________(come) in time.

8.There is no reason in______________(argue).

9.If the train _________________(come) in time, we would not have been late at the concert.

10.Yesterday at 5 o’clock Tom _______________(do) his homework and could not go for a walk.

11.Yesterday by 5 o’clock Tom_______________(do) his homework and could go  for a walk.If you ________________(phone) me, I would go to the cinema.

12.When her mother came home, she______________(write) the letter and___________(go) to the park with her friends.

13.If he _______________( buy) a car, we’ll go to the see.

14.If he___________________(buy) a car, we would go to the see.

15.If he____________________(buy)a car , we would have gone to the see.

16.My father _________________(work) here for three years.

17.My father__________________( repair) this car since morning.

18.If I had learned the grammar rules, I __________________(not /get)  a bad mark.

19.If I learned the grammar rules, I_______________________(not/ get) a bad mark.

20.If I learn the grammar rules, I_______________________( not / get) a bad mark.