Becky tells her friend about the Rule of 72 and her friend immediately

Mathematics

1 answer:

yaroslaw [1]2 years ago

3 0

Answer:

a. the investment earns 4%

b. yes

Step-by-step explanation:

The "rule of 72" says that an investment earning compound interest at x% will double in value after 72/x years. That is, ...

f(x) = 72/x

We interpret f(4) to mean Becky's friend is interested in the doubling time for an investment that earns 4% interest.

Using the above formula, ...

f(4) = 72/4 = 18

The friend's math is correct.

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sukhopar [10]

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(a) 144

(b) 117

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(e) 5472

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To find the LCM of two numbers, first find the prime factorization of each number. Then the LCM is the product of common and not common factors with the larger exponent.

(a)

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