X=2 because 3 times 2 is 6 and then you add 6 and 7 together and get 13.
Answer:
this is the graph to the equation :) hope this helps in all ways possible:)
Step-by-step explanation:
Use the formula
n(n-1)/2
which is the total number of connections between n points
So,
4(3)/2 = 6
the answer is option C.
Hope this helps