Answer: All real numbers :)
Yessss that should be correct
Answer:
70%
Step-by-step explanation:

<u><em>Calculate</em></u>
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<u><em>Cross out the common factor</em></u>
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<u><em>Multiply a number to both the numerator and the denominator</em></u>
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<u><em>Write as a single fraction</em></u>
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<u><em>Calculate the product or quotient</em></u>
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<u><em>Calculate the product or quotient</em></u>
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<u><em>Rewrite a fraction with denominator equals 100 to a percentage</em></u>
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%
<em>I hope this helps you</em>
<em>:)</em>
The formula for the amount A in an account with principal P and interest rate r compounded annually for t years is
... A(t) = P(1+r)^t
You want to find A when P=400, r=0.05, and t=3. Substituting those values gives you
... A(3) = 400·(1 +0.05)³
The appropriate choice is
... A. A(3) = 400·(1 +0.05)³
2x+4.7=77.8
double the unknown number then add 4.7