Write the complex number in polar form. Express the argument in degrees.6i
A. 6(cos 270° + i sin 270°)
B. 6(cos 90° + i sin 90°)
C. 6(cos 180° + i sin 180°)
D. 6(cos 0° + i sin 0°)
Answer: B
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Solve the system of equations.
A. (6, -6) B. (-6, 6) C. ? D. (-6, -6)
Add or subtract as indicated. Simplify if necessary.
+ 
A. 
B. 
C. 
D. 
Find the area of the rectangle or square.Length = 12 cm, width = 3 cm
A. 30 cm2 B. 36 cm2 C. 15 cm2 D. 72 cm2
Solve.The sales of typewriters have declined considerably in recent years because of the advent of computers. Assume that there were 23 million typewriters sold in 1980 and 5 million sold in 1990. In addition, assume the sales are decreasing according to the exponential decay model. Find the value k, and write an exponential function that describes the number of typewriters sold after time t, in years. (Round decimals to three places.)
A. k = 0.161; S(t) = 23e-0.161t, where S(t) is in millions and t is the number of years since 1980. B. k = 0.153; S(t) = 23e-0.153t, where S(t) is in millions and t is the number of years since 1980. C. k = 0.314; S(t) = 23e-0.314t, where S(t) is in millions and t is the number of years since 1980. D. k = -0.153; S(t) = 23e-0.153t, where S(t) is in millions and t is the number of years since 1980.