22. A square gate in a wood fence has a diagonal brace. Write a formula for the area of a square as a function of the length of its diagonal. 23. Express the surface area of a cube as a function of its volume. 24. Suppose the average family spends 25% of its income I on food F, and 10% of this amount Fis spent on junk food J. Write J as a function of I.

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