Tam giác RST R=90 độ , đường cao RH. Từ H kẻ HE vuông góc RS, HF vuông góc RT. Biết RT = 28cm, ST = 35cm. a/ Tính EF;
b/ Tính chu vi tam giác HFT
c/ Gọi M là trung điểm của HT, vẽ MK vuông góc RT. Chứng minh rằng RE. FM = KF. EF

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

If g^-1(x) is the inverse of g (x) which statement must be true