Evaluate the expression, given x = -2, y = 3, and a = -4.-9a + 2y + 9x
A. -60
B. 37
C. 59
D. 24
Answer: D
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Rotate the coordinate axes to change the given equation into an equation which has no cross product (xy) term. Identify the graph of the equation as a hyperbola, ellipse, parabola, a straight line, or parallel lines.5x2 + 6xy + 5y2 = 15
A. 8u2 + 2v - 15 = 0; Parabola B. 8u2 - 2v2 - 15 = 0; Hyperbola C. 8u2 + 2v2 - 15 = 0; Ellipse D. 8u2 + 2u - 15 = 0; Parallel lines
Use a special product formula to simplify.(3x + 7y)2
A. 9x2 + 49y2 B. 3x2 + 42xy + 49y2 C. 3x2 + 49y2 D. 9x2 + 42xy + 49y2
Find an equation of variation for the given situation.y varies jointly as x and z, and y = 225 when x = 9 and z = 5
A. y = 25x
B. y = 
C. y = 7xz
D. y = 5xz
Perform the indicated operations in the proper order.-2 - 32 - (-8)
A. 19 B. 15 C. -19 D. -3