document.write( "Question 376937: For 1980 through 1995, the annual sales, S (in thousands of dollars) of a photography studio can be modeled by S = -1/8t^2 + 3t +42, where t=0 represents 1980. During which year did the studio sell $59,500? \n" ); document.write( "
Algebra.Com's Answer #268035 by nerdybill(7384)\"\" \"About 
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For 1980 through 1995, the annual sales, S (in thousands of dollars) of a photography studio can be modeled by S = -1/8t^2 + 3t +42, where t=0 represents 1980. During which year did the studio sell $59,500?
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\n" ); document.write( "Set S to 59.5 and solve for t:
\n" ); document.write( "59.5 = -1/8t^2 + 3t +42
\n" ); document.write( "476 = -t^2 + 24t + 336
\n" ); document.write( "0 = -t^2 + 24t - 140
\n" ); document.write( "0 = t^2 - 24t + 140
\n" ); document.write( "0 = (t-14)(t-10)
\n" ); document.write( "t = {10, 14}
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\n" ); document.write( "1980+10 = 1990
\n" ); document.write( "and
\n" ); document.write( "1980+14 = 1994
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\n" ); document.write( "Ans: 1990 and 1994\r
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