Cho tam giác ABC có góc B=45 độ, góc C=30 độ.Đường trung trực của cạnh BC cắt cạnh ÁC tại D. Số đo góc ABD là???

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Identify this conic section. x2 - y2 = 16 o line circle ellipse parabola hyperbola