Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find the pH if [H3O+] = 1.0 × 10-6.
A. -8
B. -6
C. 6
D. 8
Answer: C
Mathematics
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Evaluate the given binomial coefficient.
A. 1 B. 36 C. 9 D. 0
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Write the sum or difference as a product containing only sines and/or cosines.cos(2?) - cos(4?)
A. cos(-2?) B. 2 sin(3?) sin ? C. -2 sin(3?) sin ? D. -2 cos(3?) sin ?
Mathematics
Find the exact value of the expression.cos 35° cos 25° - sin 35° sin 25°
A. 
B. 
C. 
D. 
Mathematics
Factor the expression completely, if possible.x4 - 27x
A. x(x + 3)(x2 - 3x + 9) B. (x2 - 3)(x2 + 9) C. x(x - 3)(x2 + 3x + 9) D. Does not factor
Mathematics