Which set of ordered pairs represents a function?

a) {(0, 1), (1,3), (1,5), (2, 3)}

b) {(0, 0), (1, 2), (2, 6), (2, 3)}

c) {(0, 0), (0, 2), (2.0), (2, 4)}

d) {(0.2), (1, 4), (2.6), (3, 6)}

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

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.

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4