document.write( "Question 996812: A student scored 72 and 89 on her first two quizzes. Write and solve a compound inequality to find the possible values for the third quiz score that would give her an average between 75 and 90, inclusive. \n" ); document.write( "
Algebra.Com's Answer #615098 by Boreal(15235)![]() ![]() You can put this solution on YOUR website! average=total/number \n" ); document.write( "number*average=total \n" ); document.write( "total must be between 225 and 270, those coming from multiplying 3 by 75 and 90 respectively. \n" ); document.write( "current total is 161. \n" ); document.write( "the score x, when added to 161 has to be between 225 and 270. But x can't be greater than 100. \n" ); document.write( "225<=161+x<=270 \n" ); document.write( "or \n" ); document.write( "64 <= x<= 100, since a score of 109 can't be obtained. \n" ); document.write( " |