Find the difference and simplify the answer. 
- 
A. 
B. 
C. 
D. 
Answer: B
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Find the gradient field F of the function f.f(x, y, z) = ln
+ z4
A. F = 
i + 
j + 
k
B. F = 
i + 
j + 
k
C. F = 
i + 
j + 
k
D. F = 
i + 
j + 
k
Solve the problem.According to the Gas Kinetic Theory, the average speed of a gas particle is given by 
where 
is the speed in m/s, k is the constant 1.38 × 10-23, T is the temperature of the gas in Kelvin, and m is the mass of the gas particle in kg. What is the average speed of an oxygen molecule with a mass of
at a temperature of 500 K?
A. 174 m/s B. 1020 m/s C. 330,700 m/s D. 575 m/s
Use special right triangles to evaluate the expression.tan 30° - sin 45°
A. 
B. 
C. 
D. 
Find: a. The center and radius of the circle. b. The x- and y-intercepts of the graph of the circle.x2 + y2 + 2 = 0
A. a. center = (0, 0); radius = 
b. (
, 0), (0, 
)
B. a. center = (0, 0); radius = 
b. (-
, 0), (
, 0), (0, 
), (0, -
)
C. a. ?
b. ?
D. a. center = (0, 0); radius = 2
b. (-
, 0), (
, 0), (0, 
), (0, -
)