The variable z is directly proportional to x, and inversely proportional to y. when x is 3 and y is 14, z has the value 3.8571428571429. what is the value of z when x = 12, and y = 23 round to at least the thousandths place if needed.

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