Find all values of x for the given function where the tangent line is horizontal.f(x) = 
A. 0
B. ± 
C. ± 
D. 0, ± 
Answer: C
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Find the unit tangent vector T and the principal unit normal vector N. r(t) = (7 + t)i + (4 + ln(sec t))j - 10k, -?/2 < t < ?/2
A. T = (cos t)i - (sin t)j; N = (-sin t)i - (cos t)j B. T = (-cos t)i - (sin t)j; N = (-cos t)i + (sin t)j C. T = (-cos t)i - (sin t)j; N = (sin t)i - (cos t)j D. T = (cos t)i + (sin t)j; N = (- sin t)i + (cos t)j
Solve the problem.Find the equation for the tangent plane to the surface 
at the point 
A. x + y + z = 0 B. z = 0 C. x + y = 0 D. x - y = 0
Provide an appropriate response.If a > 0, which of the following correctly describes - 
?
A. Zero B. Positive C. Not a real number D. Negative
Solve the equation by factoring.8x2 = -15x - x3
A. {-3, -5} B. {0, 3, 5} C. {3, 5} D. {0, -3, -5}