Solve the problem.How many liters of a 20% alcohol solution must be mixed with 30 liters of a 50% solution to get a 30% solution?
A. 60 L
B. 9 L
C. 6 L
D. 90 L
Answer: A
Mathematics
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Collect like terms.-8a + 2.2 - 0.2c - 8a + 3 - 8c + 16a
A. -32a - 8.2c + 5.2 B. -6c + 3 C. -8.2c + 5.2 D. -16a + 7.8c + 5.2
Mathematics
Find the angle ? between the given vectors to the nearest tenth of a degree.
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics
Give the exact value of 
.
?
A. 
B. 
C. 
D. 
E. ?
Mathematics
Multiply.
A. 
B. 
C. 
D. 
Mathematics