Find all solutions of the equation in the interval [0, 2?).2 cos2 ? - 3 cos ? + 1 = 0
A. 
, 
, 
B. 0, 
, 
C. 0, 
, 
D. 0, 
, 
Answer: C
Mathematics
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Use the vectors u, v, and w in the accompanying figure to graph the vector. 
v - w
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.How many liters of a 20% alcohol solution must be mixed with 50 liters of a 70% solution to get a 40% solution?
A. 125 L B. 12.5 L C. 7.5 L D. 75 L
Mathematics
Translate the sentence into an equation. Use x to represent the unknown number. Adding 7 to the product of 5 and a number equals 42.
A. 7x + 5 = 42
B. 5x + 42 = 7
C. 
+ 7 = 42
D. 5x + 7 = 42
Mathematics
For problem 5-9, solve the system of equations by substitution.
A. 
B. 
C. 
D. 
E. None of these
Mathematics