Express in terms of i.
A. 4i
B. -i
C. ± 4
D. -4i
Answer: A
Mathematics
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Solve the equation by factoring.x(3x + 16) = 12
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 42 ft and the vertical clearance must be 21 ft at a point 18 ft from the center. Find an equation for the ellipse. 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Find the y-intercept for the graph of the quadratic function.y + 9 = (x - 3)2
A. (0, 6) B. (9, 0) C. (0, -6) D. (0, 0)
Mathematics
Find an equation of variation in which y varies directly as x and the following is true.y = 90, when x = 10
A. y = 10x
B. y = 
C. y = 90x
D. y = 9x
Mathematics