giúp mik vs mn ơi

Một quả bóng hình cầu có diện tích bề mặt là 1256 cm² tính bán kính của quả bóng đó (π≈3,14)

giúp vs ạ

1.xác định hệ số a,b,c của phương trình bâc hai 4x²+ 5x-2019=0

2. tính chu vi hình tròn có bán kính bằng 5cm

3.cho hàm số y=(5m+10)x² tìm m để hàm số đồng biến khi x>0

4.Vẽ đồ thị hàm số (P):y=X²

5 Giải phương trình trùng phương x⁴- 8x²-9 =0

6 tính tổng và tính tích các nghiệm của PT 2x³-3x-2=0

giúp mik với mn ơi mai thi r

1.The man......................... visited our school yesterday is a famous artist

2.The girl.............................. is standing over there is my younger sister

3.Mary works for a company...................... makes toys for children

4.The supermarket..........................was destroyd in the fire has now been rebuilt

5.The bus....................runs every twenty minutes goes to Tan son nhat airport

6.An architect is someone.............designs buildings

7.I don't like people...................... often tell lies

8.Alexander bell was the man...............................invented the telephone

9.The sun...................................................is one of millions of stars in the universe provides us with heat light

10.The book............................................................you borrowed yesterday is a present from my uncle on my 15^t cemtury

giúp mik với 

1. you saw that smoke It came from the hills

.....................................................................

2.People's carelessness can cause forest fires.They are dangerous

...........................................................................................................

3.Nam is very intelligent.He learns in our class

.........................................................................

4.Minh is one of my best friends I have known her since we were at school

......................................................................................................................

5.The new stadium will be opened next week It can hold 120,000 people

...................................................................................................................

6.my mother works as an engineer she is an excellent cook

.................................................................................................

7.etna is an active volcano.The volcano is on the island of sicily.

....................................................................................................

1 Nam is fluent in speaking english

Nam can