Find the second-order partial derivative.Find 
when z = ln ?2x + 9y?.
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Solve the exponential equation. Round to three decimal places when necessary.(3.5)x = 47
A. 3.086 B. 3.061 C. 3.197 D. 3.073
Mathematics
Determine if the argument is valid or invalid. Give a reason to justify answer.If it is cold, then you need a coat.You do not need a coat. ? It is not cold.
A. Valid by the law of contraposition B. Invalid by fallacy of the inverse C. Invalid by fallacy of the converse D. Valid by the law of syllogism
Mathematics
Solve the equation by completing the square.x2 - 4x + 1 = 0
A. {2 + 
, 2 - 
}
B. {-2 + 
}
C. {-2 + 
, -2 - 
}
D. {2 + 
}
Mathematics
Add. Do not use a number line except as a check.-13 + 
+ 83 + 
A. 
B. - 
C. 
D. 
Mathematics