1. \( x^{2}+y^{2}+14 x-8 y+56=0 \) 2. \( 9 x^{2}+9 y^{2}-6 x-36 y-107=0 \) 3. \( x^{2}+y^{2}+8 x+20=0 \) 4. \( x^{2}+y^{2}+2 x-2 y+11=0 \) 5. \( x^{2}+y^{2}-8 y=0 \) B. Write the center-adius form of each circle. 6. center at origin, radius 6 7. center at \( (6,1) \), redius 7 8. center at \( (-2,0) \), diameter 16 9. center at \( (3,1) \), diameter 8 10. center at arigin, radius 8 C. Write the general form of the following. 11. \( x^{2}+(y-7)^{2}=9 \) 12. \( (x-3)^{2}+(y-3)^{2}=16 \) 13. \( (x+1)^{2}+(y-4)^{2}=25 \)

21) A frame is 15 in by 25 in aud is of uniform widtls. The inside of the frame leaves \( 75 \% \) of the total area available for the picture. What is the width of the frame?

How do you rotate 270 degrees counterclockwise about the origin? What is the rule for rotating 270 degrees about the origin? 

Dar la ecuacuion parametrica y vectorial de la recta \( 2 x+y=5 \). Grafica

23) The farmer in the previous problem has a neighber who has a field 325 ft by 420 ft . His neighbor wants to increase the size of his field by \( 20 \% \) by cultivating a band of uniform width around the outside of his lot. How wide a band should his neighbor cultivate?

Равные отрезки \( A B \) и \( D C \) лежат на параллельных прямых, а отрезки \( A C \) и \( B D \) пересекаютоя в точке \( M \). Найди \( M C \), если \( A C=56 \).