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# Function concepts

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Lena rediscovered a savings account that she had opened a long time ago. As shown in the graph, A(t) gives the amount of money in the account as a function of the number of years since she opened the account.

Jun 11, 2021

#1
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Slope: $\frac{36-30}{23-0} = \frac{6}{23}$

$y = \frac{6}{23} x + b$

$30 = b$

$y = \frac{6}{23} x + 30$

$y \in \mathbb{R}$

For the last box, I don't know the options, so how about you show us the options for the last one.

Jun 11, 2021
#2
+33689
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The domain is the scope of the 'x' values    [0,23]      which represents years.

So the domain is   23 from 0 inclusive         represents years

Jun 12, 2021