Final answer:
The area of the walkway around the garden is represented by the equation I = 6x^2 + 2.5x - 1.5 (Option a).
Step-by-step explanation:
The equation that represents the area of the walkway around the garden is I = 6x^2 + 2.5x - 1.5 (Option a).
To find the area, we can use the quadratic formula or factor the equation if possible.
Since option a is the only one that matches the given equation, it is the correct answer.