Find the exact value by using a half-angle identity.cos 

A.    
B.  
C.  
D.  

Answer: D

Mathematics

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Provide an appropriate response.Using the law of sines, find c if a = 12.5, A = 63° and B = 88° in triangle ABC. Round to four significant digits.

A. 5.754 B. 14.02 C. 6.801 D. 0.4487

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Mathematics

Solve the equation. Express radicals in simplest form.x2 = 0.16

A. {0.4} B. {8} C. {-5, 5} D. {-0.4, 0.4}

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Mathematics

If a rock is thrown downward with an initial velocity of 14 feet per second, then its velocity , in feet per second, after  seconds is given by

.
Identify the slope, and explain in practical terms its meaning.

What will be an ideal response?

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Mathematics

Find the exact value. Do not use a calculator.sec 

A. - 
B.
C. - 
D. -2

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Mathematics