Solve the system of equations. x - y + 5z = -25x
= 0 x + 5y 
= 10
A. {(0, 2, -2)}
B. {(0, 0, 2)}
C. {(0, 2, 0)}
D. {(2, 0, 0)}
Answer: C
Mathematics
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250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.The number of students scoring 75 points or more is approximately
A. 83. B. 75. C. 158. D. 125. E. none of these
Mathematics
Write the number in scientific notation.2,800,000
A. 2.8 × 10-6 B. 2.8 × 105 C. 2.8 × 10-5 D. 2.8 × 106
Mathematics
Solve the problem. Round your answer to three decimals.How long will it take for an investment to triple in value if it earns 8.5% compounded continuously?
A. 13.797 years B. 12.925 years C. 8.155 years D. 6.462 years
Mathematics
Change to a mixed number or a whole number.
A. 
B. 7
C. 8
D. 9
Mathematics