document.write( "Question 170768: An aluminum plate is made according to the following dimensions. The outer radius is 10 inches and the inner radius is 3 inches. (See diagram below) Use p = 3.14 as an approximate value. (a) How many square inches in area is the aluminum plate (the shaded region)? (b) If the cost to construct the plate is $7.50 per square inch, what is the construction cost? \n" ); document.write( "
Algebra.Com's Answer #126068 by Mathtut(3670)\"\" \"About 
You can put this solution on YOUR website!
well I cant see the shaded area but I think I know what they are after .\r
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\n" ); document.write( "Area of the total is \"A=%28pi%2910%5E2\" Area of the interior portion is \"A=%28pi%293%5E2\" we have \"100%28pi%29-9%28pi%29\"= \"91%28pi%29\"=\"highlight%28A=285.74%29\"sq in
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\n" ); document.write( "\"285.74%287.5%29=highlight%282143.05%29\"dollars
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