Determine the real solutions to the system of nonlinear equations.x2 - 3y2 = 13x2 + 3y2 = 15
A. (1, 2), (-1, -2)
B. (2, 1), (-2, -1)
C. (1, 2), (-1, 2), (1, -2), (-1, -2)
D. (2, 1), (-2, 1), (2, -1), (-2, -1)
Answer: D
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Solve the problem.The number of births in County A has been increasing in recent years. Use the information given on the bar graph for the years 1960 and 1990, letting 
represent the year 1960 and letting y represent the number of births.
A. y = 
x + 
B. y = 
x + 1693
C. y = 
x - 2190
D. y = 
x + 1693
What part of the set of objects is shaded?
A. 
B. 
C. 
D. 
Use a graphing calculator to approximate the vertex of the graph of the parabola defined by the following equation.y = 4x2 - x + 2
A. (-0.125, 1.9375) B. (0.125, 2) C. (0.125, 1.9375) D. (0.125, 2.0625)
Solve the problem.An object is propelled vertically upward from the top of a 288-foot building. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. How many seconds does it take until the object finally hits the ground? Round to the nearest tenth of a second if necessary.
A. 2 sec B. 4.5 sec C. 10.7 sec D. 1.7 sec