What is the length of BC?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.