Solve the problem.Approximately 4 × 103 employees of a certain company average $30,000 each year in salary. Write the total amount earned by all the employees of this company per year in scientific notation.
A. $1.2 × 109
B. $1.2 × 108
C. $12 × 109
D. $12 × 108
Answer: B
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Solve the problem.dy/dt = ky + f(t) is a population model where y is the population at time t and f(t) is some function to describe the net effect on the population. Assume k = .02 and 
when t = 0. Solve the differential equation of y when f(t) = 9t.
A. y = -450t - 22,500 + 32,500e-.02t B. y = 450t - 22,500 + 32,500e-.02t C. y = 450t + 22,500 + 32,500e-.02t D. y = -450t - 22,500 + 32,500e.02t
Find the center-radius form of the equation of the circle.center (-
, -2), radius 
A. (x + 
)2 + (y + 2)2 = 
B. (x - 
)2 + (y - 2)2 = 4
C. (x + 
)2 + (y + 2)2 = 2
D. (x - 
)2 + (y - 2)2 = 2
Find an algebraic expression that represents the area of the shaded region.
6x - 8
A. 36x2 - 96x + 64 B. 36x2 + 96x - 64 C. 36x2 - 96x - 64 D. 36x2 + 96x + 64
Graph the circle.(x - 4)2 + (y + 1)2 = 25
A. 
B. 
C. 
D. 