Write an equation for a cross section of the parabolic ear (used to hear sounds from a distance) shown in the picture.
?
d = 2.25 inches
A. 
B. ?
C. ?
D. ?
E. 
Answer: E
Mathematics
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Simplify. 
A. 
B. 
C. 
D. 
Mathematics
Find an equation for the conic. If the conic is a parabola, assume that the vertex is at the origin. If the conic is an ellipse or hyperbola, assume that it is centered at the origin.Focus at (2, 0) and e = 
A. 
+ 
= 1
B. 
+ y2 = 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Find the exact values of the indicated trigonometric functions. Write fractions in lowest terms.
Find tan A and cot A.
A. tan A = 
; cot A = 
B. tan A = 
; cot A = 
C. tan A = 
; cot A = 
D. tan A = 
; cot A = 
Mathematics
Solve the equation.x2 + 9x = 0
A. {0, 9} B. {0, - 9} C. {- 9} D. {9}
Mathematics