document.write( "Question 1141674: A reflecting telescope's mirror diameter is 76 inches and depth is 42 inches. Where would the focus of the mirror be located? Answer to the nearest hundredth.
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Algebra.Com's Answer #762259 by josgarithmetic(39620)\"\" \"About 
You can put this solution on YOUR website!
Imagine a parabola with vertex at (0,0) and points (38, 42) and (-38, 42). Can you work with that, find the equation, and go all the way to the solution?\r
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\n" ); document.write( "\n" ); document.write( "---\r
\n" ); document.write( "\n" ); document.write( "\"y-0=a%28x-0%29%5E2\"
\n" ); document.write( "\"y=ax%5E2\"
\n" ); document.write( "\"a=y%2Fx%5E2\"
\n" ); document.write( "\"a=42%2F%2838%29%5E2\"
\n" ); document.write( "\"a=%282%2A3%2A7%29%2F%282%2A19%2A2%2A19%29\"
\n" ); document.write( "\"a=21%2F%282%2A19%5E2%29\"
\n" ); document.write( "\"a=21%2F722\"
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\n" ); document.write( "\"y=%2821%2F722%29x%5E2\"
\n" ); document.write( "\"highlight_green%28%28722%2F21%29y=x%5E2%29\"
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\n" ); document.write( "If p is distance from vertex to focus, then \"4p=722%2F21\";
\n" ); document.write( "\"p=722%2F%284%2A21%29\"
\n" ); document.write( "\"p=361%2F21\"
\n" ); document.write( "\"highlight%28p=17%264%2F21%29\"
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\n" ); document.write( "\"highlight%28p=17.19%2Ainches%29\"
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