Which choice can be used to confirm that a quadrilateral is a parallelogram
a. quadrilateral is a parallelogram if it has two pairs of parallel sides
b. a quadrilateral is a parallelogram a good has two congruent sides and two non-congruent sides
c. a quadrilateral is a parallelogram if it has two adjacent congruent angles
d. quadrilateral is a parallelogram if it has opposite angles that are not congruent

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?