Solve the system by the substitution method.xy = 14x - y = -3
A. 
B. 
C. 
D. {(-4, 4), (1, -1)}
Answer: A
Mathematics
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Find all the first order partial derivatives for the following function.f(x, y) = sin2 (8xy2 - y)
A. 
= 2sin (8xy2 - y) cos (8xy2 - y); 
= 2sin(8xy2 - y) cos(8xy2 - y)
B. 
= 16y2sin (8xy2 - y) cos (8xy2 - y); 
= 2sin (8xy2 - y) cos (8xy2 - y)
C. 
= 16y2sin (8xy2 - y) cos (8xy2 - y); 
= (32xy - 2) sin (8xy2 - y) cos (8xy2 - y)
D. 
= 2sin (8xy2 - y) cos (8xy2 - y); 
= (32x - 2) sin (8xy2 - y) cos (8xy2 - y)
Mathematics
Find the limit.
cos 
A. -1
B. 
C. 0
D. 1
Mathematics
Solve the equation.0.21(x + 20) + 0.34(x + 30) = -13.1. (Round to the nearest whole number, if necessary.)
A. {-10} B. {10} C. {50} D. {-50}
Mathematics
Based on the graph, find the range of y = f(x).f(x) = 
A. (-10, 10) B. (-?, ?) C. (-?, 0) or {0} or (0, ?) D. (-?, 0) or (0, ?)
Mathematics