Suppose that y is inversely proportional to x. Use the given information to find the constant of proportionality k. Then use y = 
to find y for the given value of x.y = 17.5 when x = 5;
Find y given x = 25.
A. k = 77.5; y = 3.5
B. k = 87.5; y = 3.5
C. k = 3.5; y = 87.5
D. k = 100; y = 4
Answer: B
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Choose the equation that matches the graph.
A. y2 = 4x B. y2 = -4x C. -4y2 = x D. x2 = -4y
Provide an appropriate response.Examine the discriminant and find the roots of the equation, rounding to the nearest tenth if necessary: 5x2 - 6x = -5
A. x = 0.6 ± 1.17i B. x = 0.6 ± 0.8i C. x = 1.4, -0.2 D. x = 3 ± 4i
Find the vertex, focus, and directrix of the parabola. Graph the equation.y2 + 12y = 8x + 4
A. vertex: (-5, -6)
focus: (-7, -6)
directrix: x = -3
B. vertex: (-5, -6)
focus: (-5, -4)
directrix: y = -8
C. vertex: (-5, -6)
focus: (-5, -8)
directrix: y = -4
D. vertex: (-5, -6)
focus: (-3, -6)
directrix: x = -7
Write the complex number in polar form. Express the argument ? in degrees, with 0 ? ? ? 360°.12 + 16i
A. 20(cos 306.9° + i sin 306.9°) B. 20(cos 53.1° + i sin 53.1°) C. 20(cos 233.1° + i sin 233.1°) D. 20(cos 126.9° + i sin 126.9°)