Write the expression in the form bi, where b is a real number.
A. -
B. 
i
C. 7
D. 
i
Answer: D
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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) = 15t.
A. y = 750t + 37,500 + 47,500e-.02t B. y = -750t - 37,500 + 47,500e-.02t C. y = -750t - 37,500 + 47,500e.02t D. y = 750t - 37,500 + 47,500e-.02t
Solve.Find the area between y = (x - 3) ex and the x-axis from x = 3 to x = 7.
A. 3e7 B. e7 + e3 C. 3e7 + e3 D. e7 - e3
Solve the problem.Ellen sells $540 worth of clothes and earns $32.40 in commission. What is her commission rate?
A. 7% B. 8% C. 0.6% D. 6%
Provide an appropriate response. If 445 is decreased by 55%, what is the new amount?
A. 818 B. 200.25 C. 122 D. 244.75