SOLUTION: Hi, can you show me how to solve the following word problem using linear equations? In 2009, the population was 6.8 billion. It is estimated that the annual growth rate is 0.07 b

Question 757175: Hi, can you show me how to solve the following word problem using linear equations? In 2009, the population was 6.8 billion. It is estimated that the annual growth rate is 0.07 billion. Assuming that the growth rate stays the same, in what year will the population reach 8.5 billion?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The sense best found is that this is arithmetic progression.
YEAR_______0 is year 2009__________POPULATION(Billions)
2009_______0__________6.8
2010_______1__________
2011_______2__________
(???)______n__________

What is n when the population is 8.5 billion? Then the year is .

Find n.
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