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If \(x\) is a non-zero number such that

\[ \frac{ 10}{y} = \frac{ 10+x} { y + x }, \]

what is the value of \(y\)?

A) 10

B) 5

C) 0

D) -5

E) -10

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\[ \frac{ 1}{4}y + 12 = 0 \]

What value of \( y \) satisfies the above equation?

A) \(-48\)

B) \( - 12 \)

C) \( - 4 \)

D) \(12\)

E) \( 48 \)

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The dollar cost of producing \(n\) tractors in a month is given by

\[ C(n) = 1000 + 200n + 30 n^2. \]

What would be the dollar cost of producing \(10 \) tractors in a month?

A) \( 230 \)

B) \( 1230 \)

C) \( 3300 \)

D) \( 6000 \)

E) \( 321000 \)

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A company's profit \(P(x)\), in dollars, for producing \(x\) cameras in one day is given by

\[ P(x) = 300 x - 20 x^2. \]

If the company produces 10 cameras in one day, what would be their profit for that day?

A) \( $ 10,000 \)

B) \( $6, 000 \)

C) \( $3, 000 \)

D) \( $ 2, 000 \)

E) \( $ 1, 000 \)

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