Answer:
(a)
![Area = ((x)/(4))^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/fnhks4vsxoebh2y07gm2iwj9zrh813pfn4.png)
Explanation:
The question is incomplete. (See comment for complete question).
From the completed question, we have:
![Total\ base\ length = x](https://img.qammunity.org/2022/formulas/mathematics/high-school/di3s5pwawpgb2j3o2swmw9ozqyfou8dgqt.png)
--- number of pyramids
Required
An expression for the area of the base
The total base length of the pyramid represents the perimeter of the base.
And since the base is a square, then the following relationship exist.
![Total\ base\ length = 4L](https://img.qammunity.org/2022/formulas/mathematics/high-school/sfmy7rxja619r5ce7kv2g4lsloxyzn1z8t.png)
Where L represents the length of each side.
This gives
![4L = x](https://img.qammunity.org/2022/formulas/mathematics/high-school/wize27rsfyua6zir9z7h2dhexmbc5gj8x3.png)
Make L the subject
![L = (x)/(4)](https://img.qammunity.org/2022/formulas/mathematics/high-school/faeh3nknlvnptfqtgxskczqc4mon6sg8bo.png)
The area of the base is then calculated as:
![Area = L^2](https://img.qammunity.org/2022/formulas/mathematics/college/voau9oq3g9046r1ubklfp43xg0asyidpl6.png)
![Area = ((x)/(4))^2](https://img.qammunity.org/2022/formulas/mathematics/high-school/fnhks4vsxoebh2y07gm2iwj9zrh813pfn4.png)