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dexar [7]
3 years ago
5

Melanie saves $20 every month in her savings account. She

Mathematics
1 answer:
OLga [1]3 years ago
8 0

Let x represent the amount of months she has been saving for.

20x - 60 = 280

Solve for x.

20x - 60 = 280

~Add 60 to both sides

20x - 60 + 60 = 280 + 60

~Simplify

20x = 340

~Divide 20 to both sides

20x/20 = 340/20

~Simplify

x = 17

Therefore, Melanie has saved for 17 months.

Best of Luck!

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Substituting the numbers, we have:

a_{n} = 4 \cdot (\frac{1}{2})^{n-1}

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This is an exponential function with base less than 1. Therefore, we can exclude graph C (which depicts a linear function), and graphs A and D (which depict an exponential function with base greater than 1).


In order to choose between graph B and E, let's evaluate the function in two different points:

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Therefore, we need to look for the graph passing through the points (1, 4) and (2, 2). That is graph E.




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