The formula for compound interest is:
Given data:
a. After ten years, that is t = 10 years, the amount in the account will be
b. After twenty years, that is t = 20 years, the amount in the account will be:
c. The time it takes for Harry's initial account value to double will be:
Therefore, the time it takes Harry's initial account to double is approximately 11 years
Answer:
k=70
Step-by-step explanation:
two ways to do this
the sum of k+110 has to equal 180, so k=70
52+58+k has to equal 180, so k=70
You have the correct answer. It is choice B) -1/4
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Explanation:
This is because we're adding -1/4 to each term to get the next one. In other words, we're subtracting 1/4 from each term to get the next one.
- term2 = term1+(d) = 1/2 + (-1/4) = 1/2 - 1/4 = 2/4 - 1/4 = 1/4
- term3 = term2+(d) = 1/4 + (-1/4) = 1/4 - 1/4 = 0
- term4 = term3+(d) = 0 + (-1/4) = 0 - 1/4 = -1/4
- term5 = term4+(d) = -1/4 + (-1/4) = -2/4 = -1/2
and so on.
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To find the common difference, all we have to do is subtract any term from its previous one.
For example:
d = (term2) - (term1)
d = (1/4) - (1/2)
d = (1/4) - (2/4)
d = (1-2)/4
d = -1/4
The order of subtraction matters, so we cannot say d = term1-term2.
