Determine whether the positive or negative sign makes the equation correct. Do not use a calculator.cos 108.5° = ±
A. Positive
B. Negative
Answer: B
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Describe the graph of the polar equation.r2 = 36 rcos ? - 6r sin ? - 9
A. Parabola opening upward with vertex (36, -6) B. Circle with radius 18 and center (18, -3) C. Circle with radius 3 and center (36, -6) D. Parabola opening to the right with vertex (36, -6)
Solve the system by using the inverse of the coefficient matrix. x - 2y + 3z = 114x + y - z = 42x - y + 3z = 10
A. ? B. {(-2, -3, 3)} C. {(2, 3, 5)} D. {(2, -3, 1)}
Write the binomial expansion of the expression.(2x2 - y)5
A. - 32x10 + 80x8y - 80x6y2 + 40x4y3 - 10x2y4 + y5 B. 32x10 + 80x8y + 80x6y2 + 40x4y3 + 10x2y4 + y5 C. 32x10 - 80x8y + 80x6y2 - 40x4y3 + 10x2y4 - y5 D. 32x10 - 80x8y - 80x6y2 - 40x4y3 - 10x2y4 - y5
Find x and y.
= 
A. x = -2, y = 7 B. x = 7, y = 7 C. x = -2, y = -2 D. x = 7, y = -2