Handwritten algebra homework showing various addition problems all summing to 28, with a focus on the commutative and associative properties.
A scanned homework assignment titled "Algebra WON: Practical Algebra I skills" by Prof. Scott Beaver, showing problems 1a through 1g with handwritten solutions all resulting in 28, and questions h and i about mathematical properties, with answers "yes" and "commutative and (associative)" respectively.