Solve the problem.A chemist needs to mix a 20% acid solution with a 70% acid solution to obtain 10 liters of a 50% acid solution. How many liters of each of the solutions must be used?
A. 2 L of the 20% solution; 8 L of the 70% solution
B. 3 L of the 20% solution; 7 L of the 70% solution
C. 5 L of the 20% solution; 5 L of the 70% solution
D. 4 L of the 20% solution; 6 L of the 70% solution
Answer: D
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A. D: 
, R: 
B. D: 
, R: 
C. D: 
, R: 
D. D: All real numbers, R: All real numbers
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A. 2 ft B. 3.5 ft C. 1.5 ft D. 2.5 ft
Find the vertex of the parabola and determine if it is a maximum or minimum. f(x) = x2 - 14x + 50
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Multiply.19.38 × 1000
A. 1938 B. 19,380 C. 193.8 D. 19.38000