rectangles = factor pairs
As I understand it, the number of factor pairs is equal to the number of rectangles.
Rectangles are related to the distributive property because you can divide a rectangle into smaller rectangles. The sum of the areas of the smaller rectangles will equal the area of the larger rectangle.
Any number is divisible by its factors.
One to one. Each factor pair represents a rectangle.
The prime factors of 42 are 2, 3 and 7. I'd have to see the rectangles to know what to write in them.
All parallelograms are not rectangles. The angles of a parallelogram need not be right angles and so the figure need not be a rectangle.
Number of factor pairs = number of rectangles
22 is a composite number with four factors, which means two rectangles.