Answer: C. 1.75x²
Explanation:
The area of a triangle can be found with the following formula, where b is the base and h is the height of the triangle.
![\displaystyle A=(1)/(2) bh](https://img.qammunity.org/2023/formulas/mathematics/middle-school/4614vtau9nbl29yeotbzkcjru8ccx7gvkh.png)
![\displaystyle A=(1)/(2) (x)(3.5x)](https://img.qammunity.org/2023/formulas/mathematics/middle-school/jjrwbnt7ou6jbwkq06dxvkksj8iy5be2qf.png)
![\displaystyle A=(1)/(2) (x)(3.5x)](https://img.qammunity.org/2023/formulas/mathematics/middle-school/jjrwbnt7ou6jbwkq06dxvkksj8iy5be2qf.png)
A = 1.75x²
The expression that represents the area of Brad's banner, in square inches, is;
C. 1.75x²