Solve the problem.The average value of a certain type of automobile was $15,900 in 1991 and depreciated to $6900 in 1994. Let y be the average value of the automobile in the year x, where x = 0 represents 1991. Write a linear equation that models the value of the automobile (y) in terms of the year x.
A. y = -3000x + 15,900
B. y = - 
x - 6900
C. y = -3000x + 6900
D. y = -3000x - 2100
Answer: A
Mathematics
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describes the population of a species of butterflies 
after they are introduced to a non-threatening habitat. How many butterflies were initially introduced to the habitat?
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+ 6
A. 14
B. 19
C. 20
D. 21
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Write the number in scientific notation.571.54
A. 5.7154 x 10-3 B. 5.7154 x 10-2 C. 5.7154 x 103 D. 5.7154 x 102
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