Complete the pairs of A's.
Ε
AECF SA
ACG
EAD
CDA

Please help me

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

With number 11 ( show how you got the answer)

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.