Cho X là một tập hợp và S(X) là tập hợp tất cả các song ánh trên X. Chứng minh rằng S(X) cùng với phép hợp thành ánh xạ là một nhóm. Nhóm này có giao hoán không? Vì sao?

Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?

Two students were asked if they liked to read. is this a good example of a statistical question? why or why not? a yes, this is a good statistical question because a variety of answers are given. b yes, this is a good statistical question because there are not a variety of answers that could be given. c no, this is not a good statistical question because there are not a variety of answers that could be given. no, this is not a good statistical question because there are a variety of answers that could be given

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?