Find the value.Let A = 
and B = 
; 3A + B
A. 
B. 
C. 
D. 
Answer: A
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Find the derivative of the function at the given point in the direction of A.
A. - 
B. - 
C. - 
D. - 
Express the repeating decimal as a fraction in lowest terms.0.
A. 
B. 
C. 
D. 
Solve the problem.Dmitri needs 5 liters of a 36% solution of sulfuric acid for a research project in molecular biology. He has two supplies of sulfuric acid solution: one is an unlimited supply of the 45% solution and the other an unlimited supply of the 30% solution. How many liters of each solution should Dmitri use?
A. 45% solution: 3 liters; 30% solution: 2 liters B. 45% solution: 1.5 liters; 30% solution: 3.5 liters C. 45% solution: 2 liters; 30% solution: 3 liters D. 45% solution: 2.5 liters; 30% solution: 2.5 liters
Complete the identity.sin (? + ?) sin (? - ?) = ?
A. cos2 ? - cos2 ? B. sin2 ? - sin2 ? C. sin2 ? - cos2 ? D. cos2 ? + cos2 ?