What is the degree of vertex A?

The degree of vertex A is 4

Step-by-step explanation:

we know that

The degree of a vertex of a graph is the number of edges incident to the vertex.

so

Determine how many edges are incident on vertex A

From picture we see that number of edges incident on vertex A is equal to 4

therefore

The degree of vertex A is 4

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

x = 12

y = 1

for the points!