Directions: for questions 15 through 20, expand each expression. directions: for questions 21 through 24, factor each expression to its simplest form. 25 through 26 choose letter matching answer

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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