cho tam giác ABC vuông tại A. vẽ đường cao AH, lấy D thuộc AC. E là hình chiếu của A trên BD. CM:a, BE. BD=BH. BC b, góc BEH bằng góc C c. góc BAH=góc BEH

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What is the slope of the line that contains the points (-2,1) and (0,-3)

Rewrite the equation x = 65 - 60p by factoring the side that contains the variable p.