Solve the problem.A chemist has two solutions that contain different concentrations of a certain acid. One is a 4% concentration and the other is an 11% concentration. How many cubic centimeters of each should the chemist mix to obtain 50 cm3 of a solution with an acid concentration of 
?
A. 24 cc of the 4% solution and 26 cc of the 11% solution
B. 26 cc of the 4% solution and 24 cc of the 11% solution
C. 25 cc of the 4% solution and 25 cc of the 11% solution
D. No solution
Answer: A
Mathematics
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Simplify the complex fraction using Method 1.
A. 
B. 
C. 32
D. 
Mathematics
Evaluate.Let a = 
i + 
j , b = 
i + 
j. Find a - b.
A. 
i + 
j
B. 
i + 
j
C. 
i + 
j
D. 
i - 
j
Mathematics
Add or subtract as indicated.
+ 
A. 2
B. 49
C. 
D. 7
Mathematics
Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y. 7x - 7y = 6-14x + 14y = -24
A. (7, 6)
B. no solution
C. 
D. (2, 4)
Mathematics