Cho tam giác ABC cân tại A, có góc A nhọn. Vẽ tia phân giác của góc BAC cắt BC tại K. a, Chứng minh tam giác ABK = tam giác ACK
b, Vẽ trung tuyến BM của tam giác ABC cắt AK tại G. Chứng minh G là trọng tâm của tam giác.
c, Cho AB= 19cm, BC= 12cm, tính đọ dài đoạn AG.

Marco is studying a type of mold that grows at a fast rate. he created the function f(x) = 345(1.30)x to model the number of mold spores per week. what does the 1.30 represent? how many mold spores are there after 4 weeks? round your answer to the nearest whole number. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores

Which of the following can be used to explain a statement in a geometric proof?

The complement of an angle is one-sixth the measure of the supplement of the angle. what is the measure of the complement angle?