Solve.The sales of typewriters have declined considerably in recent years because of the advent of computers. Assume that there were 22 million typewriters sold in 1980 and 6 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 = 0.309; S(t) = 22e-0.309t, where S(t) is in millions and t is the number of years since 1980.
B. k = 0.13; S(t) = 22e-0.13t, where S(t) is in millions and t is the number of years since 1980.
C. k = 0.179; S(t) = 22e-0.179t, where S(t) is in millions and t is the number of years since 1980.
D. k = -0.13; S(t) = 22e-0.13t, where S(t) is in millions and t is the number of years since 1980.
Answer: B
You might also like to view...
Solve the quadratic equation. Write complex solutions in standard form.x2 - 4x + 13 = 0
A. 5, -1 B. 2 ± 3i C. -2 ± 3i D. 4 ± 6i
Provide an appropriate response.In solving a system of three equations in three variables, the final step yields the following equation: 
How many solutions does this system have? Explain geometrically.
What will be an ideal response?
Simplify the expression.
?
What will be an ideal response?
Write in radical form. Assume all variables represent positive real numbers.(8m + n) 4/5
A. 
B. 
C. 
D. 