Make the indicated conversion.31,680 ft = 
mi
A. 7
B. 6
C. 6.5
D. 158.4
Answer: B
Mathematics
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Find all the second partial derivatives.z = ex/y
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= ex/y
; 
= 
= -ex/y
C. 
= 
; 
= -ex/y
; 
= 
= ex/y
D. 
= 
; 
= ex/y
; 
= 
= -ex/y
Mathematics
Graph the equation. Identify the coordinates of the vertex.y = x2 - 1
A. (0, 1) B. (1, 0) C. (-1, 0) D. (0, -1)
Mathematics
Write the percent as a decimal.
%
A. 3.6075 B. 0.0435 C. 0.3625 D. 0.3675
Mathematics
Determine whether the proportion is true or false.
= 
A. True B. False
Mathematics