Tổng các nghiệm của phương trình(x mũ 2 +4)(x+6)(x mũ 2 -4)=0 là A.16 B.6 C.-10 D.-6

pt x mũ 2 - 2x=0 có số nghiệm là A.1 nghiêm B.2 C.vô nghiệm D.vô số nghiệm

giúp vs ạ Part 1: Choose the sentence (A, B, C, or D) that is closest in meaning to the root sentenc Question 39: She spends one hour riding to school every day. A. It takes her one hour to ride to school every day. B. It took her one hour to ride to school every day. C. It take her one hour to ride to school every day. D. It takes her one hour ride to school every day. Question 40: People had already left the flooded village when rescue workers arrived A. By the time rescue workers arrived, people had already left the flooded village. B. By the time rescue workers arrive, people had already left the flooded village. C. By the time rescue workers arrives, people had already left the flooded village. D. By the time rescue workers had arrived, people had already left the flooded village. Question 41: I can't buy this house because it is very expensive. A. If the house isn't very expensive, I could buy it. B. If the house was very expensive, I could buy it. C. If the house wasn't very expensive, I could buy it. D. If the house wasn't very expensive, I can't buy it. Question 42: "We can send people to Mars next year" NASA said. A. NASA said that they can send people to Mars the following year. B. NASA said that they can send people to Mars next year. C.NASA said that they could send people to Mars the following year. D. NASA said that they could send people to Mars next year. Question 43: She will make a big cake for the party. A big cake will to make for the party. B. A big cake will be made for the party. C. A big cake will be make for the party. D. A big cake will make for the party.

Pha 100g nước ở 100°C vào m g nước ở 40°C .Bt nhiệt độ cuối cùng của hỗn hợp nc là 60°C .Tính m A.100g B.200g C.150g D.250g

Viết một đoạn văn ngắn bằng tiếng Anh khoảng (50-60 từ) nói về phương tiện GIAO TIẾP yêu thích của em

Cho biểu thức A =x²+4x+4/3x+6

a) Tìm điều kiện xác định của A b) Rút gọn biểu thức A. c)Tính giá trị của biểu thức A khi x =1/4

giúp voi ạ em cần gấp (lưu ý phần tìm x không đc sử dụng dấu ngoặc ngọn,ngoặc vuông)