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Blizzard [7]
3 years ago
10

The resale value of a textbook decreases by 25% with each previous owner. A new textbook is sold for $85. Which function represe

nts the resale value of the textbook after x owners?
Mathematics
2 answers:
Eddi Din [679]3 years ago
9 0
A exponential function would represent it nicely f(x)=b*a^x
Reason being a decrease of %
a = 1+r
r = -25% = -0.25
And b being what the original cost of the book
f(x)=85*0.75^x
Where f(x) is the price after x amount of previous owners
8_murik_8 [283]3 years ago
5 0
Since the value decreases by 25% each time, the next cost is the current cost times 0.75 (since new cost is 75% of current cost).
To find the value of the book after x times sold, you can use:
cost = 85(0.75)^x 
Just plug in the number of times it is resold to find the value.
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Answer:

5

Step-by-step explanation:

If a population is decreasing by 8% we can multiply the population by 92% (1-.08)

which means we have the following equation

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we want to know when the population will be 10,000 so we write

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a rule we have is

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.66667=.92^n\\=log_{.92}.66667

compute this and get

4.867

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