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Question
Math
Posted 3 months ago
3 folders cost $2.91\$ 2.91.
Which equation would help determine the cost of 2 folders?
Choose 1 answer:
(A) 2$2.91=x3\frac{2}{\$ 2.91}=\frac{x}{3}
(B) 2x=3$2.91\frac{2}{x}=\frac{3}{\$ 2.91}
(C) x2=3$2.91\frac{x}{2}=\frac{3}{\$ 2.91}
(D) 2x=$2.913\frac{2}{x}=\frac{\$ 2.91}{3}
(E) None of the above
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Answer from Sia
Posted 3 months ago
Solution by Steps
step 2
The correct equation should relate the cost of 2 folders (let's call it xx) to the cost of 3 folders ($2.91\$2.91). Since 3 folders cost 2.91,wecanwritetheproportionas2.91, we can write the proportion as \frac{x}{2} = \frac{\2.91}{3}
step 3
This equation can be solved to find the value of xx, which represents the cost of 2 folders
C
Key Concept
Proportions and Direct Variation
Explanation
When quantities vary directly, their ratios are equal, which is the basis for setting up proportions to solve for an unknown value.

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