So based on your question where there is a rectangle inscribed in a semicircle or a radius 10 as shown in your figure. The possible function that could represent the are of the rectangle is A=2x*sqrt(100-x^2) i hope you are satisfied with my answer and feel free to ask for more
No. When you plug in x and y you get 2=3
all real numbers such that y is less than or equal to 4
2.5x + 4x = 39
6.5x = 39
x = 39 / 6.5
x = 6
