Be honest teachers asked her which of these three expressions are equivalent to each other 9x - 3x -4, 12x - 4, 5x + x - 4

21

step-by-step explanation:

11279

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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