Find the critical number(s), if any, of the function 
Select the correct answer.
a. ±5
b. -3
c. 3
d.± ?5
d.± ?5
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Find the indicated derivative.Find y " if y = -7 cos x.
A. y " = -7 sin x B. y " = 7 sin x C. y " = 7 cos x D. y " = -7 cos x
Factor out the greatest common factor.x2 + 12x
A. x(x2 + 12) B. x2(1 + 12x) C. x(x + 12) D. No common factor
Simplify the expression.-19 + 4 - 11
A. -12 B. -4 C. 26 D. -26
Solve.The outline of a certain planet can be considered a circle with a radius of approximately 4000 miles. Thus, if the center of this planet is located at (0, 0), then an equation for this circle is 
. Suppose an incoming meteor is approaching the planet in a hyperbolic path. The equation describing the meteor's path is 
Will the meteor strike the planet? If so, locate the point (x, y) where the meteor will strike. Assume that x and y are both positive, and round to three significant digits.
A. Yes, at the point (x, y) ? (5370, 6690) B. Yes, at the point (x, y) ? (4710, 4000) C. Yes, at the point (x, y) ? (7590, 4000) D. No, the meteor will not strike the planet.