Final answer:
The area of Zachary's rectangle is 289/16 units squared.
Step-by-step explanation:
The area of Zachary's rectangle can be found by multiplying its length and width. The rectangle measures 4 1/4 units by 4 1/4 units. To multiply mixed numbers, convert them to improper fractions. So, 4 1/4 becomes 17/4. Multiply the two fractions: (17/4) * (17/4) = 289/16. The area of Zachary's rectangle is 289/16 units squared.