Which pair of expressions is equivalent using the Associative Property of Multiplication?

A. 4 (2a ⋅ 5) = (4 ⋅ 2a) ⋅ 5

B. 4 (2a ⋅ 5) = 8a ⋅ 20

C. 4 (2a ⋅ 5) = (2a ⋅ 5) ⋅ 4

D. 4 (2a ⋅ 5) = 4 ⋅ 2a ⋅ 5

Vera bought a black velvet dress because it was on sale for 25%off. The original price was $73. How much did Vera save?

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Give a counterexample for the statement: All square roots are ration numbers

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Solve 3x-5y=13 4x+8y=-9

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