document.write( "Question 780578: The mean of three test grades is 74. What must the fourth test grade be to increase the mean to 78? \n" ); document.write( "
Algebra.Com's Answer #475625 by rfer(16322) ![]() You can put this solution on YOUR website! (74+74+74+x)/4=78 \n" ); document.write( "222+x=78*4 \n" ); document.write( "222+x=312 \n" ); document.write( "x=312-222 \n" ); document.write( "x=90 \n" ); document.write( " |