Which algebraic expression represents the phrase “four times a number”?
a. 4 c
b. c - 4
c. 4÷c
d. 4c

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