Solve the problem.A chemist needs to mix a 20% acid solution with a 70% acid solution to obtain 8 liters of a 50% acid solution. How many liters of each of the solutions must be used?
A. 1.6 L of the 20% solution; 6.4 L of the 70% solution
B. 2.4 L of the 20% solution; 5.6 L of the 70% solution
C. 4 L of the 20% solution; 4 L of the 70% solution
D. 3.2 L of the 20% solution; 4.8 L of the 70% solution
Answer: D
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Find the indicated term for the arithmetic sequence with first term, a1, and common difference, d.Find a41, when a1 = -4, d = 
A. - 9
B. 
C. 1
D. - 
Solve by completing the square. Give exact solutions. Simplify radicals and reduce.x2 + 16x + 53 = 0
A. -8 ± 
B. 8 + 
C. -16 + 
D. 8 ± 
Solve the problem.Jack borrowed $770 from his brother. Jack's brother wants 12 monthly payments of 
to repay the loan. How much extra is Jack's brother charging for the loan?
A. $960 B. $110 C. $190 D. $1060
Use a calculator to approximate the square root. Round to three decimal places.
A. 15.067 B. 15.054 C. 15.082 D. 15