document.write( "Question 287829: Laura jogs seven blocks the first day of her training program. She increases
\n" ); document.write( "her distance by two blocks each day. On the last day she jogs 25 blocks How many days was she in training? \n" ); document.write( "

Algebra.Com's Answer #208615 by josmiceli(19441) $\"\"$ $\"About$

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The 2nd day would be
\n" ); document.write( " $\"7%2B2\"$ blocks
\n" ); document.write( "then
\n" ); document.write( " $\"7+%2B+4\"$
\n" ); document.write( " $\"7+%2B+6\"$
\n" ); document.write( " $\"7+%2B+8\"$
\n" ); document.write( "The formula for this is:
\n" ); document.write( " $\"7+%2B+2%2A%28d-1%29\"$ where $\"d\"$ is the day number
\n" ); document.write( "given:
\n" ); document.write( " $\"7+%2B+2%2A%28d-1%29+=+25\"$
\n" ); document.write( " $\"7+%2B+2d+-+2+=+25\"$
\n" ); document.write( " $\"2d+=+25+%2B+2+-+7\"$
\n" ); document.write( " $\"2d+=+20\"$
\n" ); document.write( " $\"d+=+10\"$
\n" ); document.write( "she was in training 10 days
\n" ); document.write( "check:
\n" ); document.write( " $\"7+%2B+2%2A%2810+-+1%29+=+25\"$
\n" ); document.write( " $\"7+%2B+18+=+25\"$
\n" ); document.write( " $\"25+=+25\"$
\n" ); document.write( "OK \n" ); document.write( "

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