document.write( "Question 1064403: If your chemistry grades are 84, 86, and 88 for the first three marking periods, what do you need to score in the fourth marking period to obtain a 90 overall average? \n" ); document.write( "

Algebra.Com's Answer #679459 by jorel1380(3719) $\"\"$ $\"About$

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To obtain a 90 overall average for 4 test, you need 90 x 4, or 360 total points. Thus far, you have 84+86+88=258 total points. 360-258=102 points needed to score on the 4th examination to average 90 points. \n" ); document.write( "

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