Multiply or divide as indicated. Write the answer in lowest terms.
÷ 
A. 
B. 
C. 
D. 5
Answer: D
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Graph the inequality.x + 2y > 0
A. 
B. 
C. 
D. 
Perform the indicated arithmetic.4
+ 3
A. 8
B. 7
C. 7
D. 7
Tank A contains 200 lbs of salt dissolved in 1000 gal of water. Tank B contains 300 lbs of salt dissolved in 1000 gal of water. The mixture from tank A is pumped to tank B at the rate of 750 gal per hr, while the mixture from tank B is pumped to tank A at the same rate. Assume that the mixture in each tank is uniform by stirring. Let A(t ) and B(t ) be the amount of salt in tanks A and B after t hours, respectively.
(a) Draw a two-compartment model for A(t ) and B(t ). (b) Use the initial conditions A(0) = 200 and B(0) = 300 to solve for A and B. (c) What are the equilibrium values of A and B? Let x and y represent the populations (in thousands) of two species that share a habitat. For each system of equations, find and assess the stability of the equilibrium points. Remember that, for real populations, both x0 and y0 must be nonnegative for ( x0, y0) to be an equilibrium point.
Solve the mixture problem.In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A. 3 liters B. 6 liters C. 4 liters D. 2 liters