Use the order of operations to simplify the expression.
? 
A. 1
B. 3
C. 
D. 
Answer: A
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Find all the second order partial derivatives of the given function.f(x, y) = tan-1 (-3x + 4y)
A. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
B. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
C. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
D. fxx(x, y) = 
;
fyy(x, y) = 
;
fxy(x, y) = fyx(x, y) = 
Use the distributive property to rewrite the expression.49(39 + 44)
A. 49 ? 39 + 49 ? 44 B. 49 + 39 + 44 C. 49 ? 39 + 44 D. 49 ? 83
Perform the indicated operation.Subtract.6x9 - 8x8 + 3x7 + 7
A. 10x9 - 12x8 - 3x7 + 11 B. 10x9 - 12x8 - 3x7 + 3 C. 2x9 - 12x8 - 3x7 + 3 D. 2x9 - 4x8 + 9x7 + 11
Find the value of the indicated trigonometric function for an acute angle ? in a right triangle.tan ? = 
Find cot ?.
A. 
B. 
C. 
D. 