Cho 2021 điểm phân biệt và không thẳng hàng. Hỏi có tất cả bao nhiêu vecto có điểm đầu và cuối không trùng nhau được lập từ các điểm đã cho? chọn đáp án:

A) 4082420

B) 4042

C) 4080400

D) 4084441

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

Peyton's field hockey team wins 4 games out of every 7 games played. her team lost 9 games. how many games did peyton's team play?

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap