Write the expression as a pure imaginary number.
A. ±20
B. -20i
C. 20i
D. 
i
Answer: C
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Convert to an exponential equation.log4 16 = 2
A. 162 = 4 B. 24 = 16 C. 416 = 2 D. 42 = 16
Graph the equation.(x + 4)2 + (y - 2)2 = 4 
A. 
B. 
C. 
D. 
Solve the problem.Two recording devices are set 2000 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 300 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
A. 1245.32 ft B. 953.94 ft C. 728.57 ft D. 2270.83 ft
Find the slope and y-intercept of the line.7x + 8y = 7
A. slope = 7; y-intercept = 7
B. slope = 
; y-intercept = - 
C. slope = - 
; y-intercept = 
D. slope = 
; y-intercept = 