What two numbers are 7 units from 0 on a number line? a) 3 and -4 b) 7 and 8 eliminate c) 7 and -7 d) 9 and 2

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