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

In stepmber, daniel and justin opened a business. during their first three months of business, their average monthly profit was $51. if during their first month, they lost $29, and during their second month, they gained $115, what was their profit or loss for their third plzzz i will give you 299 points