The perimeter of a rectangle is 56 meters, and its length is 15 meters. Which equation can be used to find the width of the rectangle? 50 points

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220