Find the product of the complex numbers. Leave answer in polar form.z1 = 2 + 2iz2 = 
- i
A. 4
B. 4
C. 4
D. 4
Answer: B
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Solve the problem.A tank initially contains 100 gal of brine in which 40 lb of salt are dissolved. A brine containing 
of salt runs into the tank at the rate of 4 gal/min. The mixture is kept uniform by stirring and flows out of the tank at the rate of 3 gal/min. Find the solution to the differential equation that models the mixing process.
A. y = 4(50 + t) - 
B. y = 4(50 + t) - 
C. y = 2(100 + t) - 
D. y = 2(100 + t) - 
Write as a number.Round 12,470 to thousands.
A. 22,000 B. 12,000 C. 13,000 D. 12,100
Solve the problem.Which of the following investments is larger after 
A. An initial amount of $2400 is deposited with $1200 deposited annually, with interest earned at 6% compounded annually. B. An initial amount of $2000 is deposited with $100 deposited monthly, with interest earned at 6% compounded monthly.
Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions.
[5ln (x + 3) - ln x - ln (x2 - 1)]
A. ln 
B. ln 
C. ln 
D. ln 