Simplify.
A. 
B. 
C. 1
D. 
Answer: D
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (7 sin 2t)i - (2 cos 2t)j + (7 csc 2t)k
A. a
= -28i - 28k
B. a
= 28i + 28k
C. a
= 8j + 28k
D. a
= -28i + 28k
Solve the problem.Find the current I when the impedance is Z = -7 - 2j and voltage is V = 2j. (Z = 
)
A. - 1 + 
j
B. - 
- 
j
C. 4 - 14j
D. - 
- 
j
A firm examines the relationship between its sales volume and its operating profitability by conducting a(n) _____ analysis.
A. operating breakeven (cost-volume-profit) B. financial breakeven C. equity breakeven D. production capacity E. economies of scale
Find the approximate annual percentage rate using the approximate annual percentage rate formula. Round to the nearest tenth of a percent.Amount financed: $315Finance charge: $26Number of monthly payments: 12
A. 18.0% B. 15.2% C. 7.9% D. 9.0%