The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product can be calculated.A is 1 × 4; B is 1 × 4.
A. AB is 4 × 1; BA is 1 × 4.
B. AB is 1 × 4; BA is 4 × 1.
C. AB is 1 × 1; BA is 4 × 4.
D. AB cannot be calculated; BA cannot be calculated.
Answer: D
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.
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According to the model, how many Americans had Internet access in 1990? Round your answer to two decimal places, if necessary.
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A. 194 million B. 97.00 million C. 100 million D. 1.92 million
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