Refer to the figure at the right.5. Name the intersection of DC and CB.(Example 2)6. Name all of the planes that arerepresented. (Example 3)7. Name the intersection of plane ABCand plane ACD. (Example 4)

EXPLANATION :
Note that the intersection of two lines or two segments is a point
The intersection of two planes is a line or a segment
5. Intersection of DC and CB
The intersection as shown in the figure is Point C.
So the answer is point C
6. Name all the planes that are represented.
A plane is a 2-dimensional shape. From the word itself, it can represent as a plane or a sheet.
The planes in the given figure are :
ABC, ACD, ADE, ABE, and BCDE
7. Intersection of plane ABC and plane ACD
The intersection is the common segment between the two planes.
That will be segment AC