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OverLord2011 [107]
3 years ago
9

7th grade math again ​

Mathematics
1 answer:
Sergio [31]3 years ago
6 0

Answer: pi

Step-by-step explanation:

Formula for circumference = 2 x pi x radius

Formula for diameter = 2 x radius

Plug in 6.25 for radius

Circumference = 2 x pi x 6.25

Diameter = 2 x 6.25

Find ratio by diving Circumference over Diameter:

(2 x pi x 6.25) / (2 x 6.25)

Simplify: answer is pi

could also be 3.14

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How much simple interest would 1000 earn in 275 days at an interest rate of 4.21%
nikitadnepr [17]
Now, there are 365 (excluding leap years) in a year, so, 275 days is not even a year, but is  275/365 of a year, or 55/73 of a year.

\bf \qquad \textit{Simple Interest Earned}\\\\&#10;I = Prt\qquad &#10;\begin{cases}&#10;I=\textit{interest earned}\\&#10;P=\textit{original amount deposited}\to& \$1000\\&#10;r=rate\to 4.21\%\to \frac{4.21}{100}\to &0.0421\\&#10;t=years\to \frac{275}{365}\to &\frac{55}{73}&#10;\end{cases}&#10;\\\\\\&#10;I=1000\cdot 0.0421\cdot \cfrac{55}{73}
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