A 12 ounce latte costs $3.00. Write an equation that relates the cost in dollars, y, to the number of ounces, X. a
y= 3x
y= 0.25%
y= 4x
y= 12x

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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