Use the distributive property to write without parentheses.- (-4v - 2r)
A. -4v - 2r
B. 4v + 2r
C. 4v - 2r
D. -4v + 2r
Answer: B
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Decide whether the expression is or is not an identity.sin (A + B) sin (A - B) = sin2A - sin2B
A. Identity B. Not an identity
Tank A contains 50 lbs of salt dissolved in 100 gal of water. Tank B contains 100 lbs of salt dissolved in 100 gal of water. The mixture from tank A is pumped to tank B at the rate of 75 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) = 50 and B(0) =100 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.
Determine whether the given point is on the graph of the equation.y = 2x - 3; (6, 9)
A. Yes B. No
Use the number line to determine whether the statement is true or false. 
-1 ? -1
A. True B. False