document.write( "Question 968381: A student has a 63.1 average in a class, and the only grade left is the final. The final is worth 30% of the student's overall grade. what does the student need to make in order to get a 70 or higher in the class? what does the student need to get to get 80 or higher? \n" ); document.write( "

Algebra.Com's Answer #591779 by KMST(5328) $\"\"$ $\"About$

You can put this solution on YOUR website!
I assume this is a real life problem.
\n" ); document.write( "If so, at this point, I should not waste your time with lengthy explanations.
\n" ); document.write( " $\"x\"$ = grade on the final exam
\n" ); document.write( " $\"final\"$ $\"grade=0.7%2A63.1%2B0.3x\"$
\n" ); document.write( " $\"final\"$ $\"grade=44.17%2B0.3x\"$
\n" ); document.write( "For a 70:
\n" ); document.write( " $\"44.17%2B0.3x=70\"$
\n" ); document.write( " $\"0.3x=70-44.17\"$
\n" ); document.write( " $\"0.3x=25.83\"$
\n" ); document.write( " $\"x=25.83%2F0.3\"$
\n" ); document.write( " $\"x=86.1\"$
\n" ); document.write( "For an 80:
\n" ); document.write( " $\"44.17%2B0.3x=80\"$
\n" ); document.write( " $\"0.3x=80-44.17\"$
\n" ); document.write( " $\"0.3x=35.83\"$
\n" ); document.write( " $\"x=35.83%2F0.3\"$
\n" ); document.write( " $\"x=119.4\"$
\n" ); document.write( "So, there is no chance for an 80.
\n" ); document.write( "With a 100 on the final:
\n" ); document.write( " $\"final\"$ $\"grade=44.17%2B0.3%2A100\"$
\n" ); document.write( " $\"final\"$ $\"grade=44.17%2B30\"$
\n" ); document.write( " $\"final\"$ $\"grade=74.17\"$ \n" ); document.write( "

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