document.write( "Question 748579: Robin has 21 books on computers. She donates z of them to the school library. How many does she have left? \n" ); document.write( "
Algebra.Com's Answer #455515 by timvanswearingen(106)![]() ![]() You can put this solution on YOUR website! She started with 21 and got rid of, or subtracted z:\r \n" ); document.write( "\n" ); document.write( " |