Perform the indicated operation. Write the result in the form a + bi.8i(8 - 5i)
A. 64i - 40i2
B. 64i + 40i2
C. 64i- 40
D. 40+ 64i
Answer: D
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Draw the next figure in the pattern.
A. 
B. 
C. 
D. 
Use the scatter plots shown, labelled a through f to solve the problem.
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Which scatter plot indicates a perfect negative correlation?
A. c B. b C. a D. f
Divide.0.151 ÷ 10,000
A. 0.0000151 B. 0.000151 C. 151 D. 0.00151
Tank A contains 250 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 400 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) = 250 and B(0) = 300 to solve for A and B. (c) What are the equilibrium values of A and B?