document.write( "Question 497868: A school has a telephone system for letting families know about emergency school closings. The system is a pyramid with 5 layers. Three parents are on the top layer of the pyramid. Each parent in each layer calls three different parents. How many parents are in the chain? \n" ); document.write( "
Algebra.Com's Answer #338528 by Flannery(124)\"\" \"About 
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LAYER ONE: 3
\n" ); document.write( "THREE PARENTS CALL THREE PARENTS EACH GIVING
\n" ); document.write( "LAYER TWO: 3*3=9 (3^2) THE NUMBER OF CALLS MADE EQUALS PARENTS IN THIS LAYER
\n" ); document.write( "NINE PARENTS CALL THREE PARENTS EACH GIVING
\n" ); document.write( "LAYER THREE: 3*3*3=27 (3^3) NINE PARENTS TIMES THREE CALLS EQUALS PARENTS IN THIS LAYER
\n" ); document.write( "TWENTY SEVEN PARENTS CALL THREE PARENTS EACH GIVING
\n" ); document.write( "LAYER FOUR: 3*3*3*3=81 (3^4) TWENTY SEVEN PARENTS TIMES THREE CALLS EQUALS THE NUMBER OF PARENTS IN THIS LAYER
\n" ); document.write( "EIGHTY ONE PARENTS CALL THREE PARENTS EACH GIVING
\n" ); document.write( "LAYER FIVE: 3*3*3*3*3=243 (3^5) EIGHTY ONE PARENTS TIMES THREE CALLS EQUALS THE NUMBER OF PARENTS IN THIS LAYER
\n" ); document.write( "ADD THE STACK OF LAYERS TOGETHER
\n" ); document.write( "3+3^2+3^3+3^4+3^5=
\n" ); document.write( "3+9+27+81+243=363\r
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