Find the domain of the rational expression. 
A. {x|x is a real number and x ? -8 and x ? -9}
B. {x|x is a real number and x ? 8 and x ? 9}
C. {x|x is a real number}
D. {x|x is a real number and x ? -8 and x ? 9}
Answer: B
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A. r = 7 sin ? B. r = 7 or r = -7 C. r = 49 D. r = 7 cos ?
Provide an appropriate response.Show that f(x, y, z) = x5y3z5 is continuous at every point (x0, y0, z0).
What will be an ideal response?
Determine the type of curve from the given information.A mirror is in the shape of a conic. If a ray of light is directed at one focus from a sufficient distance, it never reaches that focus, but is instead reflected toward the other focus. What type of curve is represented by the mirror?
A. Hyperbola B. Parabola C. Ellipse D. None of the above
Simplify ?-20
What will be an ideal response?