Find all values of x (if any) where the tangent line to the graph of the function is horizontal.y = -0.01x2 - 0.4x + 40
A. 20
B. 10
C. -20
D. -10
Answer: C
Mathematics
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A. -2 cos(5?) sin ? B. 2 sin(5?) sin ? C. -2 sin(5?) sin ? D. cos(-2?)
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Find the exact value of the expression or state that it does not exist.sin(tan-1 2)
A. 
B. 5
C. 
D. 2
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Find the exact value of the expression in degrees without using a calculator or table.arcsin 
A. 300° B. 30° C. 315° D. -30°
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Multiply.(2x - 5)(x - 1)
A. 2x2 - 8x + 5 B. x2 + 5x - 7 C. x2 - 7x - 8 D. 2x2 - 7x + 5
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