The function below represents the interest Larissa earns on an investment. Identify the term that represents the amount of money
2 answers:
Option b: 7000
Explanation:
The function that Larissa earns on an investment is
The amount of money originally invested by Larissa can be found using the compound interest formula,
where
P is the amount of money invested. (Principal)
r is the rate of interest which can be expressed as decimals.
x is the number of periods.
Hence, comparing with the formula
, the principal amount can be determined.
Thus, the principal amount is 7000.
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Then we begin by crossing one off from each side, until we get to the middle. However, we see that our middle here is both 30 and 40.
What we do in a case like this is add up the two numbers and divide by 2 (essentially find the mean of the two middlemost numbers). Let's do that now:
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