Compare and contrast the pairs of quadrilaterals based upon properties of sides and angles 1.parallelograms and rectangles sides: angles: relationship: 2.parallelograms and squares sides: angles: relationship:

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Two florida panthers were weighed. one weighs 6x+21 pounds and the two together weigh 14x+11 pounds how much does he other panther weigh alone

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.