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ArbitrLikvidat [17]
2 years ago
6

Lisa purchased a hat for $10 , a purse for $20 and a book for $23 the sales-tax rate was 7.2 percent what was the total amount s

he paid ?
Mathematics
1 answer:
Lubov Fominskaja [6]2 years ago
8 0
Answer: 56.816
Step by step: 10+20+23=53
7.2% of 53= 3.816
53+3.816=56.816
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Step-by-step explanation:

1) Use Division Distributive Property: (x/y)^a = x^a/y^a.

\frac{1}{ {27}^{x - 8} }  = 27

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1 =  {27}^{1 + x - 8}

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1  =  {27}^{x - 7}

5) Use Definition of Common Logarithm: b^a = x if and only if log<u>b</u><u> </u>(x) = a.

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\frac{0}{ log_{27}}  = x - 7

8) Simplify 0/log_27 to 0.

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10) Switch sides.

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<u>Therefor</u><u>,</u><u> </u><u>the</u><u> </u><u>answer</u><u> </u><u>is</u><u> </u><u>x</u><u> </u><u>=</u><u> </u><u>7</u><u>.</u>

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