Which statement must be true to prove that a quadrilateral is a parallelogram? a) consecutive angles are acute. b) opposite angles are complementary. c) consecutive angles are complementary. d) opposite angles are congruent.

George is folding a piece of paper to make an origami figure. each time he folds the paper, the thickness of the paper is doubled. the paper starts out flat, with a thickness of 1 millimeter. a. write a list of six ordered pairs showing the output as the thickness of the paper when the input is the number of times it is folded. explain how you came up with your ordered pairs. b. is this relation a function? explain why or why not using the ordered pairs you came up with in part a.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Collin did the work to see if 10 is a solution to the equation r/4=2.4