Cho tam giác ABC có AB = AC. Gọi H là trung điểm của cạnh BC. a) CMR: AH là tia phân giác của BAC và góc B = góc C.
b) CMR: AH vuông góc với BC.
c) Trên tia đối của tia HA lấy điểm K sao cho HK = HA. CMR: CK //AB.

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Choose the linear inequality that describes the graph. the gray area represents the shaded region. a: y ≤ –4x – 2 b: y > –4x – 2 c: y ≥ –4x – 2 d: y < 4x – 2

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.