For the following exercises, test each equation for symmetry.

23. (r=4+4 sin heta)

24. (r=7)

25. Sketch a graph of the polar equation (r=1-5 sin heta .) Label the axis intercepts.

26. Sketch a graph of the polar equation (r=5 sin (7 heta)).

27. Sketch a graph of the polar equation (r=3-3 cos heta)