SOLUTION: Laura jogs seven blocks the first day of her training program. She increases her distance by two blocks each day. On the last day she jogs 25 blocks How many days was she in train

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Question 287829: Laura jogs seven blocks the first day of her training program. She increases
her distance by two blocks each day. On the last day she jogs 25 blocks How many days was she in training?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The 2nd day would be
7%2B2 blocks
then
7+%2B+4
7+%2B+6
7+%2B+8
The formula for this is:
7+%2B+2%2A%28d-1%29 where d is the day number
given:
7+%2B+2%2A%28d-1%29+=+25
7+%2B+2d+-+2+=+25
2d+=+25+%2B+2+-+7
2d+=+20
d+=+10
she was in training 10 days
check:
7+%2B+2%2A%2810+-+1%29+=+25
7+%2B+18+=+25
25+=+25
OK