4. \( P, Q \) and \( R \) are the points \( (3,8),(-3,4) \) and \( (5,6) \) respectively. Find the equatio ns of perpendicular bisectors of \( P Q, Q R \), and \( R P \) and show that all three are concurrent.

6. Jennifer wants to plant a flower garden in the space shown. She wants to add a fountain that is 3 feet wide and 3 feet long. What is the area of the space left to plant flowers?

3 ¿A qué altura llega una escalera de \( z=8 u \) di largo en un muro vertical, si su base está situada a \( x=6 u \) del muro?

12. Mike used a coordinate plane to design the patio shown at the right. Each unit on the grid represents 1 yard. To buy materials to build the patio, Mike needs to know its perimeter. What the perimeter of the patio?

Se tiene un rectángulo en forma de triángulo rec- tángulo, cuyos catetos miden \( x=12 u \) y \( y=35 \) \( u \). ¿Qué cantidad de malla se necesita para cer- carlo?

A farmer buys 58 feet of fencing material to build a rectangular livestock pen. Fill in the second columi of the table to find the length of the pen if the width is \( 4,6,8,10 \), or 12 feet. Then find the area of each of the pens formed.