What is 2 3/4 + 3/4?

and how did you solve it

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

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.