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 F is spent on junk food]. Write] as a function of I. 25. Cliff left point A at 8 AM. walking east at 3 kph. Renz left point A at 9 AM. walking north at 4 kph. (a) Express the distance between Cliff and Renz as a function of the elapsed time t since 8 AM. [b] Express the distance between Cliff and Renz as a function of the elapsed time t since 9 AM. (c) How far apart are Cliff and Renz at 12:00 noon on the same day? (d) At what time are they 20 km apart