Solve. Remember to insert units when writing your answer.The sediment on the bottom of a creek is normally 22 cm thick, but a recent flood washed away 
of sediment. How thick is it now?
A. 21 cm
B. 210 cm
C. 12 cm
D. 21.9 cm
Answer: A
Mathematics
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Find the derivative.y = x3 cos 4x2
A. 8x4 sin (4x2) + 3x2 cos 4x2 B. -8x4 sin (4x2) C. sin (4x2) + 3x2 cos 4x2 D. -8x4 sin (4x2) + 3x2 cos 4x2
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Add.-21 + (-20)
A. -1 B. 41 C. 1 D. -41
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Solve the linear inequality. Other than ?, use interval notation to express the solution set and graph the solution set on a number line.5x - 5 ? 4x - 11
A. [-6, ?)
B. (-?, -6]
C. (-?, -6)
D. (-16, ?)
Mathematics
Use a graphing utility to obtain the plane curve represented by the given parametric equations.Witch of Agnesi: x = 3 cot t, y= 3 sin2 t, 0 ? t < 2?
A. 
B. 
C. 
D. 
Mathematics