document.write( "Question 121265This question is from textbook beginning and intermediate algebra
\n" ); document.write( ": Hi could someone please help me with this problem?
\n" ); document.write( "x=e^-7.85 my teacher saids the answer is 3.90* 10^-4 I don't understand how she got this \n" ); document.write( "
Algebra.Com's Answer #88973 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
Hi could someone please help me with this problem?
\n" ); document.write( "x=e^-7.85 my teacher said the answer is 3.90* 10^-4
\n" ); document.write( "I don't understand how she got this
\n" ); document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "I have a TI-84 calculator.  I'm guessing yours is similar.\r\n" );
document.write( "\r\n" );
document.write( "After clearing the screen, I hit the 2nd key and then\r\n" );
document.write( "the key which has LN on it with ex above\r\n" );
document.write( "it.  Then I see\r\n" );
document.write( "\r\n" );
document.write( "e^(\r\n" );
document.write( "\r\n" );
document.write( "so then I type -7.85 and close the parentheses with a )\r\n" );
document.write( "\r\n" );
document.write( "Then when I press ENTER I see\r\n" );
document.write( "\r\n" );
document.write( "3.897519683E-4\r\n" );
document.write( "\r\n" );
document.write( "We round off the first part to 3.90 and we interpret the\r\n" );
document.write( "E to stand for \"Exponent of 10\" which represents \"×10^\"\r\n" );
document.write( "and we have\r\n" );
document.write( "\r\n" );
document.write( "3.90 × 10-4\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );