Specify the center and radius of the circle.4x2 + 4y2 + 32x + 16y - 20 = 0
A. center: (-4, -2); radius: 5
B. center: (-2, -4); radius: 5
C. center: (2, 4); radius: 25
D. center: (4, 2); radius: 25
Answer: A
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Find the acute angle, in radians, between the lines.7x + 5y = -10 and 2x + 5y = -6
A. 0.8419 radians B. 1.001 radians C. 0.5700 radians D. 2.141 radians
Solve the quadratic equation in the complex number system by completing the square.x2 + 6x + 25 = 0
A. {1, -7} B. {-3 - 16i, -3 + 16i} C. {-3 + 4i} D. {-3 + 4i, -3 - 4i}
An equation of the terminal side of an angle ? in standard position is given along with a restriction on x. Find the indicated trigonometric function value of ?. Do not use a calculator.
, x ? 0; Find sin ?.
A. 
B. 
C. 
D. 5
Determine whether the variation model is of the form 
or 
and find k. Then write a model that relates y and x.
x
5
10
15
20
25
y
-1.5
-3
-4.5
-6
-7.5
A. 
B. 
C. 
D. 
E. 