Which of the following illustrates the truth value of the given conjunction? the number is an integer, and a rational number.

a) f t → f
b) t t → t
c) t f → f
d) f f → t

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