Bài 3: Cho tam giác ABC vẽ ra phía ngoài tam giác ABC là các hình vuông ABDE và ACFK. Chứng minh: a) EK vuông góc với trung tuyến AM của tam giác ABC và EK=2AM. b)Nếu I là đỉnh thứ tư của hình bình hành EAKI, thì I thuộc đường cao AH của tam giác ABC. c) CD=BI ; CD vuông góc với BI và BF=CI ; BF vuông góc với CI. d) Ba đường thẳng BI, CF, AH đồng quy

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Which of the functions below could have created this graph?