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2) 4x - 4 works

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16x-16=4
X=4

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16x-16= 4x

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B because you can have 4x  with x representing 4 with 4x4 equaling 16 and have 16x minus 16

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Charis's amount by the end of 2 years is now $8,400. 140/100 = 1.4
1.4/3 = 4. 2x2 = 8.4. 8.4 as a whole is $840

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140/100=1.4/3=4.2x2=8.4 so in 2 years Charis earns a simple intrest of $8.40.

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140/100=1.4x3=4.20$for one year
4.2x2=8.40$ for 2years

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She will earn $8,400 at the end of two years
3×10=30
30×140=4,200
4,200×2=$8,400

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Charis invested $140. She earned a simple interest of 3% per year on the initial investment. If no money was added or removed from the investment, what was the amount of interest Charis received at the end of two years? 

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%//.    $
—————.    $4.2 is for one year
100.    140.    4.2*2=$8.40
1.         1.40
3.        4.2

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She earned an interest of $84 at the end of 2 years and then if you put the money all together its $224

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$8.40 for 2 years.

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140 is og price           3% of 140 = 4.2
3% per year               4.2 x 2 = 8.4
Find 2 year                 140 + 8.4 = $148.40