Solve the system of equations using Cramer's Rule if it is applicable. If Cramer's Rule is not applicable, say so.
A. x = 7, y = 5, z = 3; (7, 5, 3)
B. x = 6, y = -7, z = -3; (6, -7, -3)
C. x = 6, y = 7, z = 3; (6, 7, 3)
D. x = 7, y = 3, z = 7; (7, 3, 7)
Answer: C
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Solve the problem. Unless stated otherwise, assume that the projectile flight is ideal, that the launch angle is measured from the horizontal, and that the projectile is launched from the origin over a horizontal surfaceA spring gun at ground level fires a tennis ball at an angle of 51°. The ball lands 11 m away. What was the ball's initial speed? Round your answer to the nearest tenth.
A. 11.8 m/sec B. 10.5 m/sec C. 110.2 m/sec D. 3.4 m/sec
Solve the inequality. Graph your solution on a number line, and write your solution in interval notation. 9x + 5 ? -22 or 9x + 5 ? 14
A. (-?, 1]
B. (-?, -3] ? [1, ?)
C. [-3, 1]
D. [-3, ?)
Write an equation for a function whose graph fits the given description.The graph of f(x) = 
is vertically stretched by a factor of 8, and the resulting graph is reflected across the x-axis.
A. y = -
B. y = 8
C. y = -8
D. y = -8
Write the equation in slope-intercept form.5x - 7y = 7
A. y = 5x - 7
B. y = 
x + 
C. y = 
x + 1
D. y = 
x - 1