Find u ? v, where ? is the angle between the vectors u and v. Round the answer to the nearest tenth.
= 6, 
= 9, ? = 
A. 46.8
B. 62
C. 108
D. 27
Answer: D
Mathematics
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Find all the second order partial derivatives of the given function.f(x, y) = ln (x2y - x)
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= - 
; 
= 
= - 
C. 
= 
; 
= - 
; 
= 
= - 
D. 
= 
; 
= - 
; 
= 
= - 
Mathematics
Evaluate and simplify completely. Write your answer as a mixed number if possible.
÷ 4
A. 
B. 
C. 33
D. 
Mathematics
Write each mixed number as an improper fraction.9
A. 
B. 
C. 
D. 
Mathematics
Find x and y.
= 
A. x = 3, y = 4
B. x = 5, y = 5
C. x = 3, y = 
D. x = 
, y = 4
Mathematics