Write the equation of the axis of symmetry.f(x) = -2x2 + 8x - 12
A. x = -4
B. x = 2
C. x = 4
D. x = -2
Answer: B
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In the circuit shown, XL = 6 Kê and R = 4 Kê. Find the angle that the voltage leads the current.
Choose the sketch that has the indicated slope.m = 
A. 
B. 
C. 
D. 
From the graph of the parabola, determine whether the parabola opens upward or downward, and find the vertex, axis of symmetry, and range of the function. Find the maximum or minimum value of the function and the intervals on which the function is increasing or decreasing.
A. Up, (2, -9), x = -9, [-9, ?), min -9, dec (-?, 2], inc [2, ?) B. Up, (2, -9), x = 2, [-9, ?), min -9, dec (-?, 2], inc [2, ?) C. Up, (2, -9), x = 2, [-4, 8], min -4, dec (-?, 2], inc [2, ?) D. Up, (2, -9), x = 2, [-9, ?), min -4, dec (-?, 2), inc (2, ?)
Find: a. The center and radius of the circle. b. The x- and y-intercepts of the graph of the circle.4x2 + 4y2 - 2y = 0
A. a. center = 
; radius = 
b. 
B. a. center = 
; radius = 
b. (0, 0), 
C. a. center = 
; radius = 
b. (0, 0)
D. a. center = 
; radius = 
b. (0, 0), 