document.write( "Question 1144581: John gets scores of 88 and 78 on his first two tests. What score must he make to get an average grade of B, which is 80 points or greater?\r
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document.write( "I got 74.\r
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document.write( "Could someone please work this problem out so I could check my answer.
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document.write( "I'm unsure if I did everything correctly. \n" );
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Algebra.Com's Answer #765734 by Theo(13342)![]() ![]() You can put this solution on YOUR website! i think you're right. \n" ); document.write( "let x = the third test score. \n" ); document.write( "you get (88 + 78 + x) / 3 >= 80 \n" ); document.write( "multiply both sides of this equaiton by 3 to get: \n" ); document.write( "88 + 78 + x >= 240 \n" ); document.write( "solve for x to get: \n" ); document.write( "x >= 74.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "when x = 74, the average is (88 + 78 + 74) / 3 = 80.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "when x is greater than 74, the average will be greater than 80.\r \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |