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6-144.
  1. The current cost of a 55-inch HDTV is $1500 and decreasing by 15% per year. Homework Help ✎

    1. What is the multiplier?

    2. What will a 55-inch HDTV cost in four years?

    3. Write an equation to calculate the cost in n years. What does each of the factors in your equation represent?

If the cost decreased by 15% each year, the new cost would be 85% of the previous year.

0.85

In one year the cost will be $1500(0.85).
In two years the cost will be [$1500(0.85)](0.85).
Continue this pattern.

Use the pattern in part (b) to write your equation.