Triangle ABC is rotated 180° about the origin to form triangle A'B'C'. If the vertex at A forms an angle with measure of 48°, and the vertex at C' forms an angle with measure of 80, what is the measure of the vertex at B?
O 48
O 52
O 80
O 128

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

Can someone tell me if this is perpendicular? !

Rewrite so the subject can be y in the formula d=m-y/y+n