Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Chandra has 2 liters of a 49% solution of sodium hydroxide in a container. What is the amount and concentration of sodium hydroxide solution she must add to this in order to end up with 7 liters of 59% solution?
A. 5 liters of 63% solution
B. 5 liters of 66% solution
C. 5 liters of 61% solution
D. 5 liters of 64% solution
Answer: A
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Graph the equation.(y - 2)2 = 8(x + 3)
A. 
B. 
C. 
D. 
Solve the problem.Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 245 miles in the same time that Dana travels 230 miles. If Chuck's rate of travel is 3 mph more than Dana's, and they travel the same length of time, at what speed does Chuck travel?
A. 46 mph B. 53 mph C. 45 mph D. 49 mph
Use trigonometric identities to find the exact value.
A. -
B. -2
C. - 
D. - 
The graph of a function is sketched below.
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Determine the interval on which the function is decreasing.
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A. (-?, -3] ? [-1, ?) B. ?[-3, -1] C. ?[-1, -1]? D. ?[1, 3]? E. (-?, -3] ? [-1, ?)?