Solve the problem.A bacterial culture has an initial population of 10,000. If its population declines to 4000 in 4 hours, when will its population be 2530? Assume that the population decreases according to the exponential model.
A. after 5 hr
B. after 7 hr
C. after 9 hr
D. after 6 hr
Answer: D
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Divide.
A. 4 + 
i
B. - 
+ 4i
C. 
- 4i
D. -4 - 
i
Solve the problem.Tasha borrowed $13,000 to purchase a new car at an annual interest rate of 9%. She is to pay it back in equal monthly payments over a 5 year period. How much total interest will be paid over the period of the loan? Round to the nearest dollar.
A. $3192 B. $1457 C. $98 D. $4145
When a company's core competencies are different from those held by competitors, those competencies are referred to as
A. distinctive competencies B. competitive advantages C. intangible competencies D. nonsubstitutable competencies
Solve the problem.Find the ordinary interest on a loan of $3450 at 9% annually for 291 days.
A. $310.50 B. $250.13 C. $3700.99 D. $250.99