document.write( "Question 260698: Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour course average a score of 788. Using an equation for the line whose graph depicts this data, predict the average score for person taking a 55-hour review course. Round your answer to the tenths place. \n" ); document.write( "
Algebra.Com's Answer #192039 by richwmiller(17219)![]() ![]() You can put this solution on YOUR website! We have two points \n" ); document.write( "(30,620) \n" ); document.write( "(70,788) \n" ); document.write( "y-y/x-x=m \n" ); document.write( "788-620/70-30=m \n" ); document.write( "168/40=84/20=42/10=4.2=m \n" ); document.write( "y=4.2x+b \n" ); document.write( "620=4.2*30+b\r \n" ); document.write( "\n" ); document.write( "b=494 \n" ); document.write( "y=4.2x+494 equation \n" ); document.write( "y=4.2*55+494=725 predicted score for 55 hours \n" ); document.write( "No need to round. \n" ); document.write( " |