document.write( "Question 1102662: THE AMOUNT OF RADIOACTIVE SUBSTANCE PRESENT, IN POUNDS, AT TIME T, IN DAYS IS GIVEN BY THE FORMULA Y=60(2)^0.2T FIND THE NUMBER OF POUNDS PRESENT IN 30 DAYS \n" ); document.write( "

Algebra.Com's Answer #717373 by josgarithmetic(39617) $\"\"$ $\"About$

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Your model is using 60 units or pounds for a starting quantity, and ASSUMING you forgot to include the NEGATIVE SIGN in your exponent expression, the model should be $\"y=60%2A2%5E%28-0.2t%29\"$ . No usually any reason for using all upper case letters including the variables, unless you have some specific purpose for distinguishing between upper and lower cases.\r
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\n" ); document.write( "\n" ); document.write( "Let t=30, and solve for y.\r
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\n" ); document.write( "\n" ); document.write( " $\"y=60%2A2%5E%28-0.2%2A30%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=60%2A2%5E%28-6%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"60%281%2F64%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y=0.9375%29\"$ or $\"y=15%2F16\"$ , or fifteen ounces \n" ); document.write( "

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