Use implicit differentiation to find the specified derivative at the given point.Find 
at the point (2, 1) for ln x + xy2 + ln y = 0.
A. - 
B. -1
C. 1
D. 
Answer: A
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Find the quadratic approximation of f at x = 0.f(x) = tan 4x
A. Q(x) = 1 + 2x2 B. Q(x) = 1 + 4x2 C. Q(x) = 1 - 2x2 D. Q(x) = 4x
Solve the problem.An airplane is flying in the direction 11° east of south at 614 km/hr. Find the component form of the velocity of the airplane, assuming that the positive x-axis represents due east and the positive y-axis represents due north.
A. 
B. 
C. 
D. 
Use the formula Z = 
from statistics (a formula used to determine the relative value of one observation to another) to evaluate the expression for the given values. Write the exact value and then write your answer rounded to two decimal places.X = 140, ? = 150, ? = 18, n = 21
A. 
, 73.83
B. 
, -0.12
C. 
, 3.52
D. 
, -2.55
Simplify the complex fraction.
A. 
B. 
C. k - 2
D. 