Geometry help please

Question

The area for any square is given by the function y=x^2, where x is the length of a side of the square and y is the area of the square. Write the equation in function notation and find the area of a square with a side length of 3.5 inches.

Answer 1

f(x) = x²

f(3.5) = 3.5²

f(3.5) = 12.25 inches²