Solve the problem.If a resistor and inductor are connected in series to a battery of emf ?, the current in the circuit is given by 
where ? is the time constant of the circuit, R is the resistance, and t is the time since the circuit was closed. Find the expression for dI/dt.
A. - 
et/?
B. 
e-t/?
C. 
e-t/?
D. 
Answer: B
Mathematics
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Solve the equation.-2x - 1 + 4(x + 1) = -5x - 2
A. 
B. 
C. 
D. 
Mathematics
Find the present value of the annuity. Round to the nearest cent.
Payments of $60,000 made semiannually for 12 years at 5% compounded semiannually
A. $531,795.00 B. $1,134,835.80 C. $1,073,099.40 D. $1,039,926.60
Mathematics
Use a calculator to find a graphical solution to the equation. Express results to the nearest thousandth.3z2 + 5z = -1
A. 1.434, 0.232 B. -0.464, -2.868 C. -0.232, -1.434 D. 0.180, -1.847
Mathematics
Solve the problem. Round to the nearest cent.Don sells real estate and receives a commission of $930. If his commission rate is 5% of the seller's net pay, what was the seller's net pay?
A. $93,000.00 B. $18,600.00 C. $22,320.00 D. $9300.00
Mathematics