Help pls

Which statement is not always true for a parallelogram? (a) opposite sides are congruent. (b) diagonals bisect each other. (c) it has 4 congruent angles. (d) consecutive angles are supplementary.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges