Solve the 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 L
B. 20 L
C. 13.3 L
D. 16 L
Answer: A
Mathematics
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Provide an appropriate response.This type of insurance accumulates a cash value.
A. term life B. comprehensive C. whole life D. coinsurance
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Use a graphing utility to graph the polar equation.r cos ? = 2
A. 
B. 
C. 
D. 
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Use the imaginary unit to write the expression.
A. ±2
B. -2i
C. 2i
D. -i
Mathematics
Write the indicated event in set notation.When four coins are tossed, exactly three tails are obtained.[Hint: When four coins are tossed, the following 16 outcomes are possible:HHHH HHHT HHTH HHTTHTHH HTHT HTTH HTTTTHHH THHT THTH THTTTTHH TTHT TTTH TTTT]
A. 
B. 
C. 
D. 
Mathematics