Find all the second order partial derivatives of the given function.f(x, y) = 
A. 
= 
; 
= - 
; 
= 
= 
B. 
= - 
; 
= 
; 
= 
= 
C. 
= - 
; 
= 
; 
= 
= 
D. 
= - 
; 
= 
; 
= 
= 
Answer: B
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Use the range rule of thumb to approximate the standard deviation.The maximum value of a distribution is 12.6 and the minimum value is 4.3. Round results to the nearest tenth.
A. 7.1 B. 2.1 C. -0.9 D. 10.7
Evaluate. The differential is exact.
A. ln 12 B. ln 4 C. 0 D. ln 7
Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at 
and 
. The cross sections perpendicular to the x-axis between these planes are squares whose bases run from the parabola 
to the parabola 
.
A. 1568 B. 1536 C. 784 D. 196
Name and classify the angle as acute, right, obtuse, or straight.
D
A. ?D: straight B. ?D: obtuse C. ?D: acute D. ?D: right