Solve the problem.The time t in years for an amount increasing at a rate r (in decimal form) to double is given by 
This is called "doubling time." How long will it take for prices in the economy to double at a 9% annual inflation rate? Round to the nearest year.
A. 23 yr
B. 8 yr
C. 7 yr
D. 13 yr
Answer: B
Mathematics
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Find the first four nonzero terms in the Maclaurin series for the function.sin x cos x
A. x - 
x3 + 
x5 - 
x7+ . . .
B. x - 
x3 + 
x5 - 
x7 + . . .
C. x + 
x3 - 
x5 + 
x7 + . . .
D. 1 + x - 
x2 - 
x3 + . . .
Mathematics
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
Mathematics
Solve the inequality. Give the solution set in both set-builder notation and graph form.x - 1 < 3 and x + 2 ? 3
A. 
B. 
C. 
D. 
Mathematics
Combine like terms.-9b + 3b
A. -6b2 B. -6b C. -12b D. 6b
Mathematics