Daryl is making a. pattern for a quilt. The pattern shows 40 squares. Every fourth square is blue. How many squars are in a pattern?

How do i do this activity, is appreciated

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 point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)