Pretend you own a company that sells items over the internet. you decide that shipping costs will be based on the total weight of a customer's purchase.
write a piecewise function for your shipping charges. include from three to five weight intervals.

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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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