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Mathematics

2 answers:

nasty-shy [4]3 years ago

6 0

6 pounds.

First, find the amount she spent. 70 - 18.88 = 51.12

Now, just divide 51.12 by the cost per pound. 51.12 / 8.52 = 6

So, Karen purchased 6 pounds of coffee.

Please consider marking this answer as Brainliest to help me advance.

kondor19780726 [428]3 years ago

4 0

Answer:

6...Please call me brainliest!

Step-by-step explanation:

Find the difference between remaining amount and starting amount. You get 51.12. Divide that by 8.52. You get 6

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What is the value of the expression 3.9 times 10^5 /1.3 times 10^2

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$\bf ~~~~~~~~~~~~\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
\qquad \qquad
\cfrac{1}{a^n}\implies a^{-n}
\qquad \qquad 
a^n\implies \cfrac{1}{a^{-n}}
\\\\
-------------------------------\\\\
\cfrac{3.9\times 10^5}{1.3\times 10^2}\implies \cfrac{3.9}{1.3}\times \cfrac{10^5}{10^2}\implies 3\times 10^5\cdot 10^{-2}\implies 3\times 10^{5-2}
\\\\\\
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