Add.13 + (-15) + 4 + (-6)
A. 38
B. -12
C. 0
D. -4
Answer: D
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Let p represent a true statement, while q and r represent false statements. Find the truth value of the compound statement.(p ? ~q) ? r
A. False B. True
Simplify the given expression. Expansion of any term is not necessary; proper recognition of the form of the expression leads to the proper result.8 cos 4x sin 4x
A. 2 sin 4x B. 4 sin 4x C. 4 sin 8x D. 8 sin 8x
Graph the function.y = -cot (?x)
A. 
B. 
C. 
D. 
Tank A contains 25 lbs of salt dissolved in 100 gal of water. Tank B contains 40 lbs of salt dissolved in 100 gal of water. The mixture from tank A is pumped to tank B at the rate of 30 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) = 25 and B(0) = 40 to solve for A and B. (c) What are the equilibrium values of A and B? 18. (