Add or subtract as indicated.(9a5 - 3a3) + (7a5 - 7a3)
A. 16a5 - 10a3
B. 16a10 - 10a6
C. 6a16
D. 6a8
Answer: A
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Perform the indicated operation. 
A. -29
B. - 
C. -39
D. 29
Identify which of three conceptual models of division (repeated subtraction, partition, missing-factor) best corresponds to the problem.The city bridge has 8 lanes, all carrying equal numbers of cars. If 264 cars drive across the bridge, how many cars cross in each lane?
A. Repeated subtraction B. Missing-factor C. Partition
Use the quadratic formula to solve the quadratic equation.4x2 + 12x = - 4
A. 
B. 
C. 
D. 
Solve the problem.An economist predicts that the buying power B(x) of a dollar x years from now will decrease according to the formula B(x) = 0.51x. How much will today's dollar be worth in 7 years? Round the answer to the nearest cent.
A. $0.62 B. $2.70 C. $3.57 D. $0.01