Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 50 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 25 L
B. 12.5 L
C. 16.7 L
D. 20 L
Answer: B
Mathematics
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Find the expected value of the random variable.The random variable X is the number of siblings of a student selected at random from a particular secondary school. Its probability distribution is given in the table.
A. 1.479 B. 2.5 C. 1.771 D. 1.375
Mathematics
Perform the indicated operations. Round to the nearest tenth.5.94 ÷ 0.5 - (3.3)2
A. 0.99 B. 5.28 C. 0.97 D. 0.57
Mathematics
Provide an appropriate response.The number of years of useful life is not a consideration in:
A. declining balance method B. sum-of-the-years-digits method C. straight-line method D. units-of-production method
Mathematics
Divide. Express the quotient as a mixed number in lowest terms. 3
÷ 8
A. 
B. 
C. 
D. 
Mathematics