The vertices of ABC are A(-4,5), B (-2,4), and C(-5,3) if triangle ABC is reflected across the line y=-1 to produce the image A'B'C' find the coordinates of the vertex B'

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.