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The figure below shows how the price of Amazon’s Kindle 2 e-book reader has decreased over time. (The data for 2011 are projected.) For example, the price was $349 when the Kindle was launched in February 2009. The price had dropped to $299 by July 2009. The graph is a straight line, and we will assume that the relationship is linear.
a) By using the information for February and July of 2009, the decrease in price over each month is $
50
/month. (Round to the nearest dollar.)

b) Select the formula for the price, in dollars, as a linear function of the time in months since February 2009. The answer is letter
.

a. Price = $578 – $10(t).

b. Price = $350 – $8(t).

c. Price = $349 – $10(t).

c) Find a formula for the price, in dollars, as a linear function of the time in months since February 2009. Using this formula, the price in January 2012, which is 35 months after the Kindle was launched, will be $
.

(Round to the nearest dollar.)

Sagot :

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