Cho tam giác ABC. gọi M, N lần lượt là trung điểm AB, AC trên tia đối của tia NM lấy điểm D sao cho N là trung điểm MD, chứng minh a, CD song song AM
b, CD = MB
d, tam giác BMC= tam giác DCM
e, MN= 1/2 DC

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.