Solve the mixture problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 40 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 10 liters
B. 20 liters
C. 13.3 liters
D. 16 liters
Answer: A
Mathematics
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Expand and simplify the given expression by use of Pascal's triangle.(3x2 - 1)3
A. 27x6 - 27x4 + 9x2 - 1 B. 27x3 - 27x2 + 9x - 1 C. 81x8 + 27x6 - 27x4 + 9x2 - 1 D. (9x4 - 6x2 + 1)3
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Use DeMoivre's Theorem to write the expression in rectangular form.(2 - 2i)5
A. -128 + 128i
B. -64 + 64i
C. -64
+ 64
i
D. - 
+ 
i
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Graph the solution set of the system of inequalities or indicate that the system has no solution.4x - y ? -8x + 2y ? 6
A. 
B. 
C. 
D. 
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Write the expression as a constant, a single trigonometric function, or a power of a trigonometric function.cos x tan x
A. cot x B. 1 C. sin x D. cos x
Mathematics