Solve the problem.How many 3-letter codes can be formed using the letters A, B, C, D, E, F, G, H, and I. Repeated letters are allowed.

A. 729
B. 19,683
C. 84
D. 504

Answer: A

Mathematics

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Multiply. Then simplify if possible. Assume that all variables represent positive values. ?   

A. 5x
B. 15x2
C. 15
D. 15x

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A. $4.46 B. $12.26 C. $10.62 D. $3.60

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Multiply.7(9 ? x)

A. 630x B. 56x C. 63x D. 53x

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