Given: a rhombus is a quadrilateral with 4 congruent sides. prove: if quadrilateral abcd does not have 4 congruent sides, then it is not a rhombus. determine the first step to prove this statement using proof by contradiction.

The box plots below show the average daily temperatures in january and december for a u.s. city: two box plots shown. the top one is labeled january. minimum at 0, q1 at 10, median at 12, q3 at 13, maximum at 16. the bottom box plot is labeled december. minimum at 1, q1 at 5, median at 18, q3 at 25, maximum at 35 what can you tell about the means for these two months? the mean for december is higher than january's mean. it is almost certain that january's mean is higher. there is no way of telling what the means are. the narrow iqr for january causes its mean to be lower.