exam Maths Puzzle Numerical Ability

8.
Write the equation of the line passing through (3, -7) and (-6, -7).

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I've had good help from this site and would really appreciate it again. PLZ!!!

Each side of a regular decagon is 20 mm long. Find the length of a segment that joins the midpoint In 1999, 18.2 million households had a dvd player. If this populaion grows at 25% annually, how many households will have a dvd player in 2004 (5 years later)? A= P(1+r)^t

I got: 55.54 million. Is this correct?
Thanks~