Write the number as indicated.A certain exotic sportscar costs three hundred twelve thousand, 
ninety-one dollars. Write the number using digits.
A. $312,991
B. $3,209,910
C. $31,291
D. $312,991,000
Answer: A
Mathematics
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A. 1.57 B. 1.66 C. 0.09 D. 0.00
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Write the phrase as a variable expression. Use x to represent "a number."The quotient of 39 times a number and -6
A. 
B. 39x + 6
C. 
D. 39x - 6
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Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. x - 2y + 3z = 114x + y - z = 42x - y + 3z = 10
A. {(2, -3, 1)} B. {(-2, -3, 3)} C. {(2, 3, 5)} D. ?
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Find the standard equation of the parabola with the given focus and directrix.Focus: (0, 3); directrix: y = 1
A. y2 = 4(x - 2) B. x2 = -4(y - 2) C. y2 = -4(x - 2) D. x2 = 4(y - 2)
Mathematics