
This problem have a little bit confused but I hope this helps
If we consider it as a combination problem, then we could calculate the how many combinations are there if we pick up three nodes out of six nodes, and then we have:

And the answer should be 20
Answer:
q = 5/18
Step-by-step explanation:
q + 5/9 = 5/6
Subtract 5/9 from each side
q + 5/9 - 5/9 = 5/6 - 5/9
q = 5/6 - 5/9
Get a common denominator of 18
q = 5/6 *3/3 - 5/9 *2/2
q = 15/18 - 10/18
q = 5/18
=> 4(7)–2(7+a)=8
<h3>=>28–14
<em>–</em>2a=8</h3><h3>=>14–2a=8</h3><h3>=>-2a=8–14</h3><h3>=>
<em>-</em>2a=-6</h3><h3>
<em>=>a=3</em></h3>
Answer:
x

Step-by-step explanation:
x = the number
3x + 8
4
3x
-4
x
