Provide an appropriate response.Determine the quadrants in which the given point (x, y) may lie when xy > 0.
A. II or IV
B. II or III
C. I or III
D. I or II
Answer: C
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Solve the problem.The function A = A0e-0.01386x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 400 pounds of the material are initially put into the vault, how many pounds will be left after 140 years?
A. 312 lb B. 57 lb C. 560 lb D. 71 lb
Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero.(x-1y5)-2
A. 
B. 
C. 
D. 
Write the decimal as a fraction or mixed number in lowest terms.0.74
A. 
B. 
C. 
D. 
Use Cramer's rule to solve the system. 6x - 7y - z = -53 x - 8y + 9z = 19 -3x + y + z = 11
A. {(8, 9, 8)} B. {(2, 8, 9)} C. {(2, -8, -9)} D. {(3, 6, 9)}