To find the total cost \( c \) that Vicky paid for the oranges, we can set up the equation based on the number of pounds she bought and the cost per pound.
Vicky bought \( 3 \frac{1}{2} \) pounds of oranges, which can be converted to improper fraction form as:
\[ 3 \frac{1}{2} = \frac{7}{2} \text{ pounds} \]
The cost per pound is $3.90. Therefore, the total cost can be calculated as:
\[ c = \text{(number of pounds)} \times \text{(cost per pound)} = \frac{7}{2} \times 3.90 \]
Now we need to simplify the equation:
\[ c = \frac{7 \cdot 3.90}{2} \]
To find total cost, we can also write it as:
\[ c = 3.90 \cdot \frac{7}{2} = 3.90 \cdot 3.5 \]
So we can express this as:
\[ c = 3.90 \cdot 3.5 \]
Calculating the total cost:
\[ c = 3.90 \times 3.5 = 13.65 \]
Now, we can look for the equation that represents this situation from the provided options.
The suitable equation that describes \( c \) is:
c = 3.90 * 3.5; Vicky paid $13.65.
This does not appear in your options verbatim, but it corresponds closely to the relationships presented.
Thus the correct interpretation from the options is:
Start Fraction c over 3.5 End Fraction equals 3.90; Vicky paid $13.65.
This can be rewritten to reflect:
\[ \frac{c}{3.5} = 3.90 \]
Thus the equation:
\[ c = 3.5 \times 3.90 \]
Final Answer:
Start Fraction c over 3.5 End Fraction equals 3.90; Vicky paid $13.65.