Which expression is equivalent to (x2 - 3x) (4x2 + 2x - 9) ?

A. x2 (4x2 + 2x - 9) - 3x

B. x2 (4x2 + 2x - 9) - 3x (4x2 + 2x - 9)

C. x2 (4x2 + 2x - 9) + 3x (4x2 + 2x - 9)

D. x2 (4x2 + 2x) - 3x (2x - 9)

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how do I solve this problem? 7/9x54=

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Riley had to add this group of numbers (56 + 47 + 53), but he wanted to add them as quickly and as easily as possible. Here is how he decided to add the numbers: 56 + 47 + 53 = 56 + (47 + 53) = 56 + 100 = 156.

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