There are 10 desks in a room. determine whether 10 is prime or composite. if it is composite list all of the ways the desks can be arranged if they are in even rows.

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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