Solve the problem.Barbara knows that she will need to buy a new car in 2 years. The car will cost $15,000 by then. How much should she invest now at 6%, compounded quarterly, so that she will have enough to buy a new car? Round to the nearest cent.
A. $14,138.94
B. $13,315.67
C. $14,150.94
D. $12,594.29
Answer: B
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Decide whether the expression is or is not an identity.cot2 
= 
A. Identity B. Not an identity
Write as a number.Round 388 to tens.
A. 400 B. 390 C. 380 D. 490
Evaluate the expression.
A. 1
B. 6
C. 0
D. 
Solve the problem using matrices.The figure below shows the intersection of three one-way streets. To keep traffic moving, the number of cars per minute entering an intersection must equal the number of cars leaving that intersection. Set up a system of equations that keeps traffic moving, and use Gaussian elimination to solve the system. If construction limits z to t cars per minute, how many cars per minute must pass through the other intersections to keep traffic moving?
A. t + 1 cars/min between I2 and I1; t + 4 cars/min between I1 and I3 B. t + 2 cars/min between I2 and I1; t - 3 cars/min between I1 and I3 C. t + 8 cars/min between I2 and I1; t + 3 cars/min between I1 and I3 D. t - 2 cars/min between I2 and I1; t + 1 cars/min between I1 and I3