C. Write the genersal form of the following. \[ \begin{array}{l}\text { 11. } x^{2}+(y-7)^{2}=9 \\ 12 .(x-3)^{2}+(y-3)^{2}=16 \\ 13(x+1)^{2}+(y-4)^{2}=25\end{array} \]

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?

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

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 \( A C=56 \).

Donna has a garden that is 30 ft by 36 ft . She wants to increase the size of the garden by \( 40 \% \). How wide a ring around the outside should she cultivate

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?