Tom and sam can finish a plowing job in two hours if they work toghether. tom working alone can do the job in 7 hours. how long would it take sam to finish the same job alone?

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