Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 
D. - 
Answer: C
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An amount P, invested at a simple interest rate r, will grow to an amount A in t years, according to the formula A = P ( 1 + r t ). Suppose a man invested some money at 5.6%. If after 3 years, he had $6,424.00 on deposit, what amount did he originally invest? Round your answer to the nearest integer.
A. P = $5,350 B. P = $5,300 C. P = $5,500 D. P = $5,600
Solve the problem.Bert is 16.5 kilometers away from Brenda. Both begin to walk toward each other at the same time. Bert walks at 3 kilometers per hour. They meet in 3 hours. How fast is Brenda walking?
A. 3 kilometers per hour B. 3.5 kilometers per hour C. 4.5 kilometers per hour D. 2.5 kilometers per hour
Solve the problem.Find out how long it takes a $3400 investment to earn $400 interest if it is invested at 9% compounded semiannually. Round to the nearest tenth of a year. Use the formula 
A. 1.1 years B. 1.5 years C. 1.7 years D. 1.3 years
Solve the problem.One airplane is approaching an airport from the north at 131 km/hr. A second airplane approaches from the east at 264 km/hr. Find the rate at which the distance between the planes changes when the southbound plane is 27 km away from the airport and the westbound plane is 25 km from the airport.
A. 1036 km/hr B. 104 km/hr C. 958 km/hr D. 275 km/hr