This I my explanation for this question if it is helpful your welcome
Yes but I can’t really see it
Well there’s 180° in one triangle. a right angle is 90°. 2x+3x+90=180. 5x=90 divide by five, x=18°
The person above me is right. It’s A , you have to add
900-573=327 To reach their goal the least amount of books they need to read is 327