Solve the problem.The function A = A0e-0.00693x 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 200 pounds of the material are initially put into the vault, how many pounds will be left after 120 years? Round to the nearest pound.
A. 83 lb
B. 87 lb
C. 112 lb
D. 120 lb
Answer: B
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Write an algebraic equation and use it to solve the problem.A chemist needs 9 liters of a 50% salt solution. All she has available is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
A. 4.5 liters of the 20% solution; 4.5 liters of the 70% solution B. 1.8 liters of the 20% solution; 7.2 liters of the 70% solution C. 2.7 liters of the 20% solution; 6.3 liters of the 70% solution D. 3.6 liters of the 20% solution; 5.4 liters of the 70% solution
Find the perimeter.
A. 28 m B. 14 m C. 20.4 m D. 21.6 m
Multiply. Write the result in the form a + bi.(7 + 4i)(7 - 4i)
A. 65 B. 49 - 16i2 C. 49 - 16i D. 33
Graph the piecewise linear function.f(x) = 
A. 
B. 
C. 
D. 