PreCalculus
posted by Amanda .
A rectangle is bounded by the xaxis and the semicircle y = √36 – x2, as shown in the figure below. Write the area A of the rectangle as a function of x, and determine the domain of the area function.
A =
all real numbers except x = 36
all real numbers except x = 6
0 < x < 6
0 < x < 36
all real numbers

PreCalculus 
Reiny
I don't see any "figure below" , but I can surmise your figure shows a quarter circle in the first quadrant with a rectangle, whose base is along the xaxis, its height along the yaxis and it touches the quarter circle at (x,y)
Area = xy
= x√(36x^2) or x(36x^2)^(1/2)
for the domain, we have to make sure that the number under the √ does not become negative, so
0 < x < 6
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