document.write( "Question 1206662: There were 15 seats in the first row of the stadium. Each subsequent row has 2 additional seats per row. If there were 10 total rows, how many seats were in the stadium? \n" ); document.write( "

Algebra.Com's Answer #844217 by Edwin McCravy(20055) $\"\"$ $\"About$

You can put this solution on YOUR website!

\r\n" );
document.write( "If you knew nothing about arithmetic sequences, you would add this row\r\n" );
document.write( "of 10 numbers:\r\n" );
document.write( "\r\n" );
document.write( "15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 + 31 + 33\r\n" );
document.write( "\r\n" );
document.write( "But since you know about arithmetic sequences you can substitute in\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "with a₁ = 15, d = 2, and n = 10\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The formula saved you from having to add 10 numbers together.\r\n" );
document.write( "\r\n" );
document.write( "It wasn't that great a help here, but some problems will require\r\n" );
document.write( "you to add 100 or even 1000 numbers. Then it will be a much bigger\r\n" );
document.write( "help.  In school you are often given easier problems to show you\r\n" );
document.write( "the principle, so you can use it on harder problems.\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );