Find the focus and the directrix of the parabola.x2 - 4x - 4y - 4 = 0
A. Focus: (2, -1); directrix: y = -3
B. Focus: (2, -3); directrix: y = -1
C. Focus: (2, -1), directrix: y = - 
D. Focus: (2, 2); directrix: y = 6
Answer: A
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A. Forty-six thousandths B. Four and 6 hundredths C. Four and six tenths D. Forty-six hundredths
Solve the problem.A water wheel rotates through the angle ?, the water level L behind the wheel changes according to the equation L = 1 - sin ? - 2 cos2 ?where L is measured in inches. Determine the values of ? for which the water level is zero. Find the exact values. Do not use a calculator.
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Graph the system of linear inequalities in two variables.
A. 
B. 
C. 
D. 
Verify the identity.csc4 x - cot4 x = csc2 x + cot2 x
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