Chrissy spent $5.00 on supplies and lemonade powder for her lemonade stand. She charges $0.50 per glass. a. Write a function P(x) to represent her profit per glass sold.
b. Find the inverse function, −1(x).
c. What do x and −1(x) represent in the context of the inverse function?
d. How many glasses must Chrissy sell in order to make a $3 profit?

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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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