Each of the 17 gorillas at the nature preserve eats 45 pounds of food and day. write an expression that models the amount of food all of the gorillas eat in a day. then evaluate the expression to find how much food they eat.

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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