Given trapezoid pqrs, which of the following must be true?
both pairs of opposite sides are parallel.
the legs are congruent to each other.
one pair of opposite sides must be congruent.
one pair of opposite sides must be parallel.

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