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Algebra 1

5.9.5 Interpret Graphs to Find Approximate Values

Algebra 15.9.5 Interpret Graphs to Find Approximate Values

5.9.5 Interpret Graphs to Find Approximate Values

5.9.5 • Interpret Graphs to Find Approximate Values

Cool Down

The graph shows the bacteria population on a petri dish as a function ff of the days dd since an antibiotic is introduced.

1.

What is the approximate value of f(4.5)f(4.5)?

2.

Approximately what is dd when f(d)=400,000f(d)=400,000?

3.

Explain what you would do, using your usual graphing technology, to be able to see f(15)f(15) on the graph.

Why Should I Care?

Exponential functions and models can help you understand the power of investment.

Let’s say you invest $1000 in a stock that grows 10% every year. By the end of the first year, that money will grow and you will have $1100. The next year, the investment will grow again, based on the new amount. Your investment has compounded.

Now, imagine that money after 20 years: $7330!

Can you think of any other areas of your life where exponential functions and models can help you?

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