The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = 4 sin t - cos tFind the body's acceleration at time t = ?/4 sec.

A.   m/sec2
B. -   m/sec2
C. -   m/sec2
D.   m/sec2

Answer: C

Mathematics

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A.
B.
C.
D.

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All references are to the figure below. The distance between A and D is a, and the distance between D and C is x. Assuming that A = 17°, ?BDC = 43°, and c1 = 60. find h, x, and a.

A. h ? 18, x ? 19, a ? 39 B. h ? 40, x ? 40, a ? 90 C. h ? 41, x ? 44, a ? 90. D. h ? 20, x ? 20, a ? 40

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Subtract.

A. 5093 B. 5143 C. 5133 D. 8143

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Simplify the expression. Write the result using positive exponents only.(x-1y6)-2

A.  
B.  
C.  
D.

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Mathematics