anonymous
  • anonymous
If 2 pounds cost $8.40, whats the cost of 3.5 pounds? a. $12.50 b.$10.75 c. $14.25 d. $14.70
Mathematics
schrodinger
  • schrodinger
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jdoe0001
  • jdoe0001
\(\begin{array}{ccllll} lbs&\$ \\\hline\\ 2&8.40\\ 3.5&x \end{array}\implies \cfrac{2}{3.5}=\cfrac{8.40}{x}\impliedby \textit{solve for "x"}\)
anonymous
  • anonymous
I don't really understand
jdoe0001
  • jdoe0001
hint: cross-multiply

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Vocaloid
  • Vocaloid
hint #2:|dw:1443830964132:dw|
Vocaloid
  • Vocaloid
|dw:1443830996696:dw| notice how I multiplied along the black arrows?
Vocaloid
  • Vocaloid
that's what cross multiplying is. that gives us 2x = 3.5*8.40 solve for x

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