If my anniversary is October 28th of 2021 and it is January 18th 2022, how long have we been dating?

X+y=-4 x-y=2 use elimination with adding and subtraction

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.

What is the surface area of the sphere?