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Ipatiy [6.2K]
3 years ago
5

Armando put $78 into a CD that pays 4.9% interest. According to the rule of

Mathematics
2 answers:
FromTheMoon [43]3 years ago
4 0

It will take 14.7 years for Armando's money to double.

Option C

<u>Explanation:</u>

The rule of 72 is generally used to estimate the number of years required to double the invested money at a given annual rate of return. And alternatively to find the number of years required to double the money at a given interest rate, we have to just divide the interest rate into 72.

Here, the interest rate is 4.9%. Therefore, it would be as follows

\Rightarrow\frac{72}{4.9} = 14.7 \text{ years }

Rule 72 can be used to identify the following:

  • Number of years it takes an investment to double,
  • Number of years it takes debt to double,
  • The interest rate must earn to double in a time frame,
  • Number of times debt or money will double in a period of time.
Anastaziya [24]3 years ago
3 0

Answer: 14.7

Step-by-step explanation:

A P E X

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A = \pi r^2

A = 3.14 \times 21~ inches \times 21~inches

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4 years ago
A rectangle with a length of L and a width of W has a diagonal of 10 inches. Express the perimeter P of the rectangle as a funct
KatRina [158]
<h2>Answer:</h2>

The expression which represents the perimeter P of the rectangle as a function of L is:

          Perimeter=2(L+\sqrt{100-L^2})

<h2>Step-by-step explanation:</h2>

The length and width of a rectangle are denoted by L and W respectively.

Also the diagonal of a rectangle is: 10 inches.

We know that the diagonal of a rectangle in terms of L and W are given by:

10=\sqrt{L^2+W^2}

( Since, the diagonal of a rectangle act as a hypotenuse of the right angled triangle and we use the Pythagorean Theorem )

Hence, we have:

10^2=L^2+W^2\\\\i.e.\\\\W^2=100-L^2\\\\W=\pm \sqrt{100-L^2}

But we know that width can't be negative. It has to be greater than 0.

Hence, we have:

W=\sqrt{100-L^2}

Now, we know that the Perimeter of a rectangle is given by:

Perimeter=2(L+W)

Here we have:

Perimeter=2(L+\sqrt{100-L^2})

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3 years ago
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