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**reiward** Can anyone help me with this ? Thank you in advance. I really need the answers because I will report this. Sorry to be of bother, I really have no idea because this hasn't been taught yet and I cant understand the book.

1. A 20 ft. ladder leans against a vertical wall. If the bottom of the ladder is pulled away at the rate of 2 ft per sec, write a formula f(t), the distance of the top of the ladder from the floor as a function of t.

2. Let P be the perimeter of an equilateral triangle. Write a formula A(P), the area of the triangle as function of the perimeter.

3. One of the legs of a right triangle has a length of 4cm. Express the length of the altitude perpendicular to the hypotenuse as a function of the length of the hypotenuse.