Solve the problem.An airplane flies 480 miles with the wind and 320 against the wind in the same length of time. If the speed of the wind is 30, what is the speed of the airplane in still air?
A. 60 mph
B. 140 mph
C. 150 mph
D. 155 mph
Answer: C
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Solve the problem. Use an annual percentage rate table if necessary.Joan used a fixed installment loan from her bank to finance her home renovation project. She borrowed $11,000 and has a 60 monthly payments of $212.67 each. Instead of making her 36th payment, Joan decides to pay the remaining balance on the loan. How much interest will Joan save (use the actuarial method)?
A. $305.65 B. $292.92 C. $309.34 D. $325.12
Solve the problem.On April 1, the unpaid balance in an account was $230. A payment of $70 was made on April 7. On April 21 a $10 purchase was made. The finance charge rate was 1.75% per month of the average daily balance. Find the new balance at the end of April.
A. $173.10 B. $233.05 C. $163.04 D. $171.75
Complex numbers are used in electronics to describe the current in an electric circuit. Ohm's law relates the current in a circuit, I, in amperes, the voltage of the circuit, E, in volts, and the resistance of the circuit, R, in ohms, by the formula 
Solve the problem using this formula.Find E, the voltage of a circuit, if I = (2 + 3i) amperes and R = (9 + 5i) ohms.
A. (3 + 37i) volts B. (37 + 3i) volts C. (3 - 37i) volts D. (37 - 3i) volts
Find the discount date and net payment date. (The net payment date is 20 days after the final discount date.)Invoice date: Nov 7Terms: 3/15 ROGGoods received: Dec 13
A. Discount date: Dec 15; net payment date: Jan 15 B. Discount date: Dec 28; net payment date: Jan 17 C. Discount date: Jan 7; net payment date: Jan 30 D. Discount date: Dec 28; net payment date: Jan 18